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Thread: Unable to achieve a low latency with Focusrite Scarlett 2i2

  1. #11
    Join Date
    Jan 2013
    Beans
    12

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    Hey,

    I was pretty optimistic after reading the post regarding blacklisting the Intel chip, however unfortunately it didn't make any difference in terms of Xruns (although it did remove the option in qjackctl for the device, so I can assume it did actually disable it!).

    In addition to running my script from earlier, I've also followed the instructions at http://darksound.co.uk/?p=256 to disable some further features. I also removed pretty much everything that autostarts in the "Session and Startup" section of the Ubuntu Studio settings.

    I'm still getting these Xruns at regular intervals. It doesn't sound at all like the machine is 'struggling' at any point before or after the Xruns - no stuttering or popping (until the Xrun itself!).

    The only thing I can think of now, is the USB cable I'm using is pretty old. I've read somewhere though that I shouldn't be able to select 96kHz if the cable is incompatible. I think this is desperation speaking however!

    One other thing I noticed - if I don't manually disable networking through the GUI before my running my script, my WiFi connection persists for some reason. I've been making sure to manually disable it each time before running the script.

    Thanks again for the support. I've still not tried to install Ubuntu Studio on my desktop, however am going to do so soon. Would rather be able to use it on my laptop however.

    I've not yet attempted to troubleshoot the Xrun messages in qjackctl, however this may be another option for me to investigate.

    ehdee

  2. #12
    Join Date
    Jan 2013
    Beans
    12

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    I think I can happily eliminate any potential issues with the hardware interface itself: I booted my desktop from a live USB containing 12.10, and it worked fine with the Focusrite Scarlett @ 96kHz with ~2msec latency. I recorded a single track beyond 4mins without and Xruns, and some additional tracks on top as well.

    My desktop PC is actually a very low powered device - an Acer Revo R3700. And it worked, with me booting off a live USB and without any tweaking whatsoever!

    I guess I could try doing the same on the laptop ie. testing when using Ubuntu Studio in 'live' mode, and see what happens.

  3. #13
    Join Date
    May 2012
    Beans
    192
    Distro
    Ubuntu Studio 12.04 Precise Pangolin

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    As the xruns seems regular (refer to the messages window in qjacktl to view accurate infos and statistics) everything smells like "something causing regular interrupts". I don't have a clear idea on how to understand what could be this "something", except looking at /proc/interrupts (in order to understand what has the same IRQ of your soundcard) and htop to have a look at processes. Have you tried by using your Scarlett into some other USB port? Commonly there are multiple hubs/controller/bus inside the computer, so what happens using a port may not happen in another port. On my desktop computer I have some usb port that are unable to make my external usb drive work properly, especially if I use a longer cable (the hard drive turns on, but the system can't mount it), so the cable could be a protagonist... but as you said... desperation speaking... especially if the xruns are regular...

    Yes, investigating the qjackctl's messages can bring us to understand something.

    So sorry but my english is bad (I'm not a native speaker, as you probably guessed) and I want to make sure about a thing... So I must make you a trivial question : have you installed ubuntu studio on your laptop or are you testing using an USB bootable drive?

    P.S. : lsusb -v can bring us some more info on what is going on USB hardware inside the machine. Run it with your Scarlett plugged. Have another look at our favourite page, http://wiki.linuxmusicians.com/doku...._configuration , paragraph "Solve IRQ Conflict by Unbinding devices". I think that it contains some good hint that can bring us to understand what interferes with the soundcard.
    Last edited by CrocoDuck; January 9th, 2013 at 11:54 AM.

  4. #14
    Join Date
    Feb 2009
    Beans
    592

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    Just a thought (a little stab in the dark really) but do you have any power stepping or power saving features enabled? It could be that something like that might cause your problem.

    Also, as Crocoduck said - its worth looking at which USB hub you connecting to and whet else might be using it. Try different hubs and check in cat /proc/interrupts to see what else shares the same IRQ.

    Good luck.

  5. #15
    Join Date
    Jan 2013
    Beans
    12

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    Hey,

    All of my testing on the laptop has been with an installed version of 12.10 x64, however I did try once using a Live USB as I was curious (it seemed to work on my desktop this way!), however it was much the same.

    It would appear that there are two USB buses on the laptop and I've tried both, and there doesn't appear to be any difference. Out of curiousity I tried testing on another Dell laptop (Inspiron 1534) and everything was much the same.

    Interestingly there is an option for 'Power' in the "Session and Startup" section in the Ubuntu Studio settings. This was one of the few settings I didn't remove. Perhaps I can try this tonight!

  6. #16
    Join Date
    Feb 2009
    Beans
    592

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    The i series intel chips (i3, i5, i7) have speed stepping capabilities that are normally enabled on laptops to save power. I have read on some pro-audio forums that this can cause some bad audio pops/crackles (xruns to us linux folk) and therefore should be disabled when you are recording. If you cant find an option of how to do this you can:

    1. Look in BIOS to see if there are options to disable it on the MOBO; or
    2. Have a look in the software under "cpu" or some such search term and look for additional software to allow you to set it. I installed a little something for it but Im not at my linux box and cant remember the name of it.

    Also, can you post the output of cat /proc/interrupts and lsusb -vvv (when your soundcard is plugged in and powered on).

    Cheers

  7. #17
    Join Date
    Jan 2013
    Beans
    12

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    Hi,

    I did a bit of research based on your post and reckon you mean the Intel SmartStep BIOS feature. Having disabled this cpufreq-info is no longer able to report back on the clockspeed of the cores, however it can be assumed that they are now running at full speed as opposed to any power saving mode.

    It doesn't appear to have helped so far, however it sounds like a good idea to keep the feature disabled for now.

    My interrupts:

    Code:
               CPU0       CPU1       CPU2       CPU3       
      0:        132          0          0          0   IO-APIC-edge      timer
      1:         16         45         17         46   IO-APIC-edge      i8042
      8:          0          1          0          0   IO-APIC-edge      rtc0
      9:          0          2          0          1   IO-APIC-fasteoi   acpi
     12:       3035      10368       3062      10368   IO-APIC-edge      i8042
     16:     295149         31     295131         34   IO-APIC-fasteoi   ehci_hcd:usb1
     17:          0          0          0          0   IO-APIC-fasteoi   brcmsmac
     23:          7         14          8         16   IO-APIC-fasteoi   ehci_hcd:usb2
     44:          0          0          0          0   PCI-MSI-edge      pciehp
     45:      17242       1613      17225       1616   PCI-MSI-edge      ahci
     47:          4          4          4          3   PCI-MSI-edge      mei
     48:        329        395        340        396   PCI-MSI-edge      radeon
    NMI:         30         72         13         30   Non-maskable interrupts
    LOC:      35332      83546      16090      32721   Local timer interrupts
    SPU:          0          0          0          0   Spurious interrupts
    PMI:         30         72         13         30   Performance monitoring interrupts
    IWI:          0          0          0          0   IRQ work interrupts
    RTR:          3          0          0          0   APIC ICR read retries
    RES:      60349      13836       1524       1006   Rescheduling interrupts
    CAL:        285        357        346        336   Function call interrupts
    TLB:        337        225        240        158   TLB shootdowns
    TRM:          0          0          0          0   Thermal event interrupts
    THR:          0          0          0          0   Threshold APIC interrupts
    MCE:          0          0          0          0   Machine check exceptions
    MCP:          4          4          4          4   Machine check polls
    ERR:          0
    MIS:          0
    And the output of lsusb:

    Code:
    Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         1 Single TT
      bMaxPacketSize0        64
      idVendor           0x8087 Intel Corp.
      idProduct          0x0020 Integrated Rate Matching Hub
      bcdDevice            0.00
      iManufacturer           0 
      iProduct                0 
      iSerial                 0 
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0001  1x 1 bytes
            bInterval              12
    
    Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         1 Single TT
      bMaxPacketSize0        64
      idVendor           0x8087 Intel Corp.
      idProduct          0x0020 Integrated Rate Matching Hub
      bcdDevice            0.00
      iManufacturer           0 
      iProduct                0 
      iSerial                 0 
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0002  1x 2 bytes
            bInterval              12
    
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x1d6b Linux Foundation
      idProduct          0x0002 2.0 root hub
      bcdDevice            3.05
      iManufacturer           3 
      iProduct                2 
      iSerial                 1 
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0004  1x 4 bytes
            bInterval              12
    
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x1d6b Linux Foundation
      idProduct          0x0002 2.0 root hub
      bcdDevice            3.05
      iManufacturer           3 
      iProduct                2 
      iSerial                 1 
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0004  1x 4 bytes
            bInterval              12
    
    Bus 001 Device 003: ID 1235:8006 Novation EMS 
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass          239 Miscellaneous Device
      bDeviceSubClass         2 ?
      bDeviceProtocol         1 Interface Association
      bMaxPacketSize0        64
      idVendor           0x1235 Novation EMS
      idProduct          0x8006 
      bcdDevice            0.cc
      iManufacturer           1 
      iProduct                2 
      iSerial                 0 
      bNumConfigurations      2
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength          287
        bNumInterfaces          4
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0x80
          (Bus Powered)
        MaxPower              500mA
        Interface Association:
          bLength                 8
          bDescriptorType        11
          bFirstInterface         0
          bInterfaceCount         3
          bFunctionClass          1 Audio
          bFunctionSubClass       0 
          bFunctionProtocol      32 
          iFunction               0 
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      1 Control Device
          bInterfaceProtocol     32 
          iInterface              2 
          AudioControl Interface Descriptor:
            bLength                 9
            bDescriptorType        36
            bDescriptorSubtype      1 (HEADER)
            bcdADC               2.00
            bCategory               8
            wTotalLength          119
            bmControl            0x00
          AudioControl Interface Descriptor:
            bLength                 8
            bDescriptorType        36
            bDescriptorSubtype     10 (CLOCK_SOURCE)
            bClockID               41
            bmAttributes         0x03 Internal programmable Clock 
            bmControls           0x07
              Clock Frequency Control (read/write)
              Clock Validity Control (read-only)
            bAssocTerminal          0
            iClockSource            9 
          AudioControl Interface Descriptor:
            bLength                 8
            bDescriptorType        36
            bDescriptorSubtype     11 (CLOCK_SELECTOR)
            bUnitID                40
            bNrInPins               1
            baCSourceID( 0)        41
            bmControls           0x03
              Clock Selector Control (read/write)
            iClockSelector          8 
          AudioControl Interface Descriptor:
            bLength                17
            bDescriptorType        36
            bDescriptorSubtype      2 (INPUT_TERMINAL)
            bTerminalID             2
            wTerminalType      0x0101 USB Streaming
            bAssocTerminal          0
            bCSourceID             40
            bNrChannels             2
            bmChannelConfig   0x00000000
            bmControls    0x0000
            iChannelNames          15 
            iTerminal               6 
          AudioControl Interface Descriptor:
            bLength                18
            bDescriptorType        36
            bDescriptorSubtype      6 (FEATURE_UNIT)
            bUnitID                10
            bSourceID               2
            bmaControls( 0)      0x00000000
            bmaControls( 1)      0x00000000
            bmaControls( 2)      0x00000000
            iFeature                0 
          AudioControl Interface Descriptor:
            bLength                12
            bDescriptorType        36
            bDescriptorSubtype      3 (OUTPUT_TERMINAL)
            bTerminalID            20
            wTerminalType      0x0301 Speaker
            bAssocTerminal          0
            bSourceID              10
            bCSourceID             40
            bmControls         0x0000
            iTerminal               0 
          AudioControl Interface Descriptor:
            bLength                17
            bDescriptorType        36
            bDescriptorSubtype      2 (INPUT_TERMINAL)
            bTerminalID             1
            wTerminalType      0x0201 Microphone
            bAssocTerminal          0
            bCSourceID             40
            bNrChannels             2
            bmChannelConfig   0x00000000
            bmControls    0x0000
            iChannelNames          33 
            iTerminal               0 
          AudioControl Interface Descriptor:
            bLength                18
            bDescriptorType        36
            bDescriptorSubtype      6 (FEATURE_UNIT)
            bUnitID                11
            bSourceID               1
            bmaControls( 0)      0x00000000
            bmaControls( 1)      0x00000000
            bmaControls( 2)      0x00000000
            iFeature                0 
          AudioControl Interface Descriptor:
            bLength                12
            bDescriptorType        36
            bDescriptorSubtype      3 (OUTPUT_TERMINAL)
            bTerminalID            22
            wTerminalType      0x0101 USB Streaming
            bAssocTerminal          0
            bSourceID              11
            bCSourceID             40
            bmControls         0x0000
            iTerminal               7 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x84  EP 4 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0006  1x 6 bytes
            bInterval               8
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              4 
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       1
          bNumEndpoints           2
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              4 
          AudioStreaming Interface Descriptor:
            bLength                16
            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink           2
            bmControls           0x00
            bFormatType             1
            bmFormats               1
              PCM
            bNrChannels             2
            bmChannelConfig   0x00000000
            iChannelNames          15 
          AudioStreaming Interface Descriptor:
            bLength                 6
            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bSubslotSize            4
            bBitResolution         24
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x01  EP 1 OUT
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0400  1x 1024 bytes
            bInterval               1
            AudioControl Endpoint Descriptor:
              bLength                 8
              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x00
              bmControls           0x00
              bLockDelayUnits         2 Decoded PCM samples
              wLockDelay              8
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes           17
              Transfer Type            Isochronous
              Synch Type               None
              Usage Type               Feedback
            wMaxPacketSize     0x0004  1x 4 bytes
            bInterval               4
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        2
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              5 
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        2
          bAlternateSetting       1
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              5 
          AudioStreaming Interface Descriptor:
            bLength                16
            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink          22
            bmControls           0x00
            bFormatType             1
            bmFormats               1
              PCM
            bNrChannels             2
            bmChannelConfig   0x00000000
            iChannelNames          33 
          AudioStreaming Interface Descriptor:
            bLength                 6
            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bSubslotSize            4
            bBitResolution         24
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x82  EP 2 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0400  1x 1024 bytes
            bInterval               1
            AudioControl Endpoint Descriptor:
              bLength                 8
              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x00
              bmControls           0x00
              bLockDelayUnits         2 Decoded PCM samples
              wLockDelay              8
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        3
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass       254 Application Specific Interface
          bInterfaceSubClass      1 Device Firmware Update
          bInterfaceProtocol      1 
          iInterface             12 
          Device Firmware Upgrade Interface Descriptor:
            bLength                             9
            bDescriptorType                    33
            bmAttributes                        7
              Will Not Detach
              Manifestation Tolerant
              Upload Supported
              Download Supported
            wDetachTimeout                    250 milliseconds
            wTransferSize                      64 bytes
            bcdDFUVersion                   1.10
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength          287
        bNumInterfaces          4
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0x80
          (Bus Powered)
        MaxPower              500mA
        Interface Association:
          bLength                 8
          bDescriptorType        11
          bFirstInterface         0
          bInterfaceCount         3
          bFunctionClass          1 Audio
          bFunctionSubClass       0 
          bFunctionProtocol      32 
          iFunction               0 
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      1 Control Device
          bInterfaceProtocol     32 
          iInterface              2 
          AudioControl Interface Descriptor:
            bLength                 9
            bDescriptorType        36
            bDescriptorSubtype      1 (HEADER)
            bcdADC               2.00
            bCategory               8
            wTotalLength          119
            bmControl            0x00
          AudioControl Interface Descriptor:
            bLength                 8
            bDescriptorType        36
            bDescriptorSubtype     10 (CLOCK_SOURCE)
            bClockID               41
            bmAttributes         0x03 Internal programmable Clock 
            bmControls           0x07
              Clock Frequency Control (read/write)
              Clock Validity Control (read-only)
            bAssocTerminal          0
            iClockSource            9 
          AudioControl Interface Descriptor:
            bLength                 8
            bDescriptorType        36
            bDescriptorSubtype     11 (CLOCK_SELECTOR)
            bUnitID                40
            bNrInPins               1
            baCSourceID( 0)        41
            bmControls           0x03
              Clock Selector Control (read/write)
            iClockSelector          8 
          AudioControl Interface Descriptor:
            bLength                17
            bDescriptorType        36
            bDescriptorSubtype      2 (INPUT_TERMINAL)
            bTerminalID             2
            wTerminalType      0x0101 USB Streaming
            bAssocTerminal          0
            bCSourceID             40
            bNrChannels             2
            bmChannelConfig   0x00000000
            bmControls    0x0000
            iChannelNames          15 
            iTerminal               6 
          AudioControl Interface Descriptor:
            bLength                18
            bDescriptorType        36
            bDescriptorSubtype      6 (FEATURE_UNIT)
            bUnitID                10
            bSourceID               2
            bmaControls( 0)      0x00000000
            bmaControls( 1)      0x00000000
            bmaControls( 2)      0x00000000
            iFeature                0 
          AudioControl Interface Descriptor:
            bLength                12
            bDescriptorType        36
            bDescriptorSubtype      3 (OUTPUT_TERMINAL)
            bTerminalID            20
            wTerminalType      0x0301 Speaker
            bAssocTerminal          0
            bSourceID              10
            bCSourceID             40
            bmControls         0x0000
            iTerminal               0 
          AudioControl Interface Descriptor:
            bLength                17
            bDescriptorType        36
            bDescriptorSubtype      2 (INPUT_TERMINAL)
            bTerminalID             1
            wTerminalType      0x0201 Microphone
            bAssocTerminal          0
            bCSourceID             40
            bNrChannels             2
            bmChannelConfig   0x00000000
            bmControls    0x0000
            iChannelNames          33 
            iTerminal               0 
          AudioControl Interface Descriptor:
            bLength                18
            bDescriptorType        36
            bDescriptorSubtype      6 (FEATURE_UNIT)
            bUnitID                11
            bSourceID               1
            bmaControls( 0)      0x00000000
            bmaControls( 1)      0x00000000
            bmaControls( 2)      0x00000000
            iFeature                0 
          AudioControl Interface Descriptor:
            bLength                12
            bDescriptorType        36
            bDescriptorSubtype      3 (OUTPUT_TERMINAL)
            bTerminalID            22
            wTerminalType      0x0101 USB Streaming
            bAssocTerminal          0
            bSourceID              11
            bCSourceID             40
            bmControls         0x0000
            iTerminal               7 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x84  EP 4 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0006  1x 6 bytes
            bInterval               8
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        1
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          bNumEndpoints           0
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              4 
        Interface Descriptor:
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          bInterfaceNumber        1
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          bNumEndpoints           2
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              4 
          AudioStreaming Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink           2
            bmControls           0x00
            bFormatType             1
            bmFormats               1
              PCM
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            bmChannelConfig   0x00000000
            iChannelNames          15 
          AudioStreaming Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bSubslotSize            4
            bBitResolution         24
          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x01  EP 1 OUT
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0400  1x 1024 bytes
            bInterval               1
            AudioControl Endpoint Descriptor:
              bLength                 8
              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x00
              bmControls           0x00
              bLockDelayUnits         2 Decoded PCM samples
              wLockDelay              8
          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes           17
              Transfer Type            Isochronous
              Synch Type               None
              Usage Type               Feedback
            wMaxPacketSize     0x0004  1x 4 bytes
            bInterval               4
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        2
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              5 
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        2
          bAlternateSetting       1
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol     32 
          iInterface              5 
          AudioStreaming Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink          22
            bmControls           0x00
            bFormatType             1
            bmFormats               1
              PCM
            bNrChannels             2
            bmChannelConfig   0x00000000
            iChannelNames          33 
          AudioStreaming Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bSubslotSize            4
            bBitResolution         24
          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x82  EP 2 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0400  1x 1024 bytes
            bInterval               1
            AudioControl Endpoint Descriptor:
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              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x00
              bmControls           0x00
              bLockDelayUnits         2 Decoded PCM samples
              wLockDelay              8
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        3
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass       254 Application Specific Interface
          bInterfaceSubClass      1 Device Firmware Update
          bInterfaceProtocol      1 
          iInterface             12 
          Device Firmware Upgrade Interface Descriptor:
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            bDescriptorType                    33
            bmAttributes                        7
              Will Not Detach
              Manifestation Tolerant
              Upload Supported
              Download Supported
            wDetachTimeout                    250 milliseconds
            wTransferSize                      64 bytes
            bcdDFUVersion                   1.10
    
    Bus 001 Device 004: ID 0c45:641d Microdia 1.3 MPixel Integrated Webcam
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      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass          239 Miscellaneous Device
      bDeviceSubClass         2 ?
      bDeviceProtocol         1 Interface Association
      bMaxPacketSize0        64
      idVendor           0x0c45 Microdia
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      bcdDevice            1.26
      iManufacturer           2 
      iProduct                1 
      iSerial                 0 
      bNumConfigurations      1
      Configuration Descriptor:
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        bDescriptorType         2
        wTotalLength          665
        bNumInterfaces          2
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0x80
          (Bus Powered)
        MaxPower              500mA
        ** UNRECOGNIZED:  28 ff 42 49 53 54 00 01 06 01 10 00 00 00 00 00 d1 10 f4 01 d2 11 f4 01 d3 12 f4 01 d4 13 f4 01 d5 14 f4 01 d6 15 f4 01
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          bDescriptorType        11
          bFirstInterface         0
          bInterfaceCount         2
          bFunctionClass         14 Video
          bFunctionSubClass       3 Video Interface Collection
          bFunctionProtocol       0 
          iFunction               4 
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      1 Video Control
          bInterfaceProtocol      0 
          iInterface              4 
          VideoControl Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      1 (HEADER)
            bcdUVC               1.00
            wTotalLength          103
            dwClockFrequency       15.000000MHz
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            baInterfaceNr( 0)       1
          VideoControl Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      3 (OUTPUT_TERMINAL)
            bTerminalID             2
            wTerminalType      0x0101 USB Streaming
            bAssocTerminal          0
            bSourceID               5
            iTerminal               0 
          VideoControl Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      6 (EXTENSION_UNIT)
            bUnitID                 4
            guidExtensionCode         {7033f028-1163-2e4a-ba2c-6890eb334016}
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          VideoControl Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      6 (EXTENSION_UNIT)
            bUnitID                 5
            guidExtensionCode         {c385b80f-c268-4745-90f7-8f47579d95fc}
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            baSourceID( 0)          4
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            bmControls( 0)       0x0f
            iExtension              0 
          VideoControl Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      2 (INPUT_TERMINAL)
            bTerminalID             1
            wTerminalType      0x0201 Camera Sensor
            bAssocTerminal          0
            iTerminal               0 
            wObjectiveFocalLengthMin      0
            wObjectiveFocalLengthMax      0
            wOcularFocalLength            0
            bControlSize                  3
            bmControls           0x00000000
          VideoControl Interface Descriptor:
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            bDescriptorType        36
            bDescriptorSubtype      5 (PROCESSING_UNIT)
          Warning: Descriptor too short
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            bSourceID               1
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              Brightness
              Contrast
              Hue
              Saturation
              Sharpness
              Gamma
              White Balance Temperature
              Backlight Compensation
              Gain
              Power Line Frequency
              White Balance Temperature, Auto
            iProcessing             0 
            bmVideoStandards     0x41
              None
          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x83  EP 3 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
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            bInterval               6
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  1 (INPUT_HEADER)
            bNumFormats                         1
            wTotalLength                      379
            bEndPointAddress                  129
            bmInfo                              0
            bTerminalLink                       2
            bStillCaptureMethod                 2
            bTriggerSupport                     0
            bTriggerUsage                       0
            bControlSize                        1
            bmaControls( 0)                    27
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  4 (FORMAT_UNCOMPRESSED)
            bFormatIndex                        1
            bNumFrameDescriptors                7
            guidFormat                            {59555932-0000-1000-8000-00aa00389b71}
            bBitsPerPixel                      16
            bDefaultFrameIndex                  1
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              Interlaced stream or variable: No
              Fields per frame: 2 fields
              Field 1 first: No
              Field pattern: Field 1 only
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          VideoStreaming Interface Descriptor:
            bLength                            46
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         1
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            640
            wHeight                           480
            dwMinBitRate                 24576000
            dwMaxBitRate                147456000
            dwMaxVideoFrameBufferSize      614400
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  5
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            500000
            dwFrameInterval( 2)            666666
            dwFrameInterval( 3)           1000000
            dwFrameInterval( 4)           2000000
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         2
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            352
            wHeight                           288
            dwMinBitRate                  8110080
            dwMaxBitRate                 48660480
            dwMaxVideoFrameBufferSize      202752
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  5
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            500000
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            dwFrameInterval( 3)           1000000
            dwFrameInterval( 4)           2000000
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         3
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            320
            wHeight                           240
            dwMinBitRate                  6144000
            dwMaxBitRate                 36864000
            dwMaxVideoFrameBufferSize      153600
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  5
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            500000
            dwFrameInterval( 2)            666666
            dwFrameInterval( 3)           1000000
            dwFrameInterval( 4)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            46
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         4
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            176
            wHeight                           144
            dwMinBitRate                  2027520
            dwMaxBitRate                 12165120
            dwMaxVideoFrameBufferSize       50688
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  5
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            500000
            dwFrameInterval( 2)            666666
            dwFrameInterval( 3)           1000000
            dwFrameInterval( 4)           2000000
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         5
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            160
            wHeight                           120
            dwMinBitRate                  1536000
            dwMaxBitRate                  9216000
            dwMaxVideoFrameBufferSize       38400
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  5
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            500000
            dwFrameInterval( 2)            666666
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            dwFrameInterval( 4)           2000000
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         6
            bmCapabilities                   0x00
              Still image unsupported
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            wHeight                           768
            dwMinBitRate                 62914560
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            dwMaxVideoFrameBufferSize     1572864
            dwDefaultFrameInterval        1111111
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            dwFrameInterval( 0)           1111111
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          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
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              Still image unsupported
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            wHeight                          1024
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            dwMaxVideoFrameBufferSize     2621440
            dwDefaultFrameInterval        1111111
            bFrameIntervalType                  2
            dwFrameInterval( 0)           1111111
            dwFrameInterval( 1)           2000000
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                  3 (STILL_IMAGE_FRAME)
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            wWidth( 0)                       1280
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            wHeight( 1)                       768
            wWidth( 2)                        640
            wHeight( 2)                       480
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            wHeight( 6)                       120
            bNumCompressionPatterns             7
          VideoStreaming Interface Descriptor:
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            bDescriptorType                    36
            bDescriptorSubtype                 13 (COLORFORMAT)
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            bTransferCharacteristics            1 (BT.709)
            bMatrixCoefficients                 4 (SMPTE 170M (BT.601))
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       1
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0080  1x 128 bytes
            bInterval               1
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       2
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
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          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0100  1x 256 bytes
            bInterval               1
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       3
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0320  1x 800 bytes
            bInterval               1
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        1
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          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
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          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
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              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0b20  2x 800 bytes
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        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       5
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          Endpoint Descriptor:
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            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x1320  3x 800 bytes
            bInterval               1
        Interface Descriptor:
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          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       6
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x1400  3x 1024 bytes
            bInterval               1

  8. #18
    Join Date
    Feb 2009
    Beans
    592

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    Well it look like your soundcard is on USB hub1 - which in turn is on IRQ 16. That in itself isnt a bad thing, but it seems that you are getting a whole bucket load of interrupts on that IRQ. This is getting a little beyond my depth of knowledge but it seems that this could be the cause of your problem.

    Have you tried the rtirq script tweaking?

    Cheers

  9. #19
    Join Date
    Jan 2013
    Beans
    12

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    Hi,

    Thanks for looking at the outputs. I wasn't 100% on how to determine which irq the soundcard was using however you've confirmed what I was thinking about it being on 16.

    I've not read anything about rtirq yet (apologies if this was suggested earlier in the thread), however I'll make this my next line of investigation!

  10. #20
    Join Date
    Feb 2009
    Beans
    592

    Re: Unable to achieve a low latency with Focusrite Scarlett 2i2

    Quote Originally Posted by ehdee View Post
    Hi,

    Thanks for looking at the outputs. I wasn't 100% on how to determine which irq the soundcard was using however you've confirmed what I was thinking about it being on 16.

    I've not read anything about rtirq yet (apologies if this was suggested earlier in the thread), however I'll make this my next line of investigation!
    As far as the IRQ is concerned I cant be sure from that output (thats my bad as I forgot to ask for the output of lspci -v). If you do that command as well you will be able to see which IRQ is assigned to the USB device by cross referencing its Device ID (as shown from lsusb) with those ID's listed from lspci -v. In this case the USB device ID appears to be "Bus 001 Device 003: ID 1235". This should allow you to see exactly what IRQ it is. Looking at the output you already gave it appears that Bus 001 is IRQ 16 so I assume that device 003 (your soundcard) will be on 16. You could always do the extra check just to be sure.

    It's still a mystery to me why you are having these problems. It might be worth trying a different audio distro from a Live CD to see if that suffers the same problem. If not then it might give an indication of what is causing the issue.

    Cheers

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