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Thread: Which Realtime Kernel?

  1. #11
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    Re: Which Realtime Kernel?


    Thanks for all the help.

    I installed 2.6.31-11-rt successfully &, after familiarising myself with Grub2, set it up so I get to see the grub menu at boot and can choose the rt kernel or the generic as required - best of both worlds.

    This thread has certainly sprouted: I hadn't realised you could tune the RT kernel's priorities - will investigate.

    As an additional question, can anyone recommend a USB or Firewire multi-channel soundcard that works well with Linux but doesn't cost the earth? Or, failing that, a simple mic in/line in/line out type with decent sound quality?

    This being a laptop, any extras have to be external.

    Thanks.

  2. #12
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    Re: Which Realtime Kernel?

    A friend of mine is using the Edirol FA-66 wit success. But any firewire card tagged with "Full support" in the ffado site[1] should work.

    [1] http://www.ffado.org/?q=devicesupport/list

    Make sure you have a compatible firewire controller.

    http://www.ffado.org/?q=node/251

  3. #13
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    Re: Which Realtime Kernel?

    Thanks Pablo_F,

    lshw throws up this for my Firewire:
    *-firewire
    description: FireWire (IEEE 1394)
    product: TSB43AB21 IEEE-1394a-2000 Controller (PHY/Link)
    vendor: Texas Instruments
    physical id: 0
    bus info: pci@0000:02:00.0
    version: 00
    width: 32 bits
    clock: 33MHz
    capabilities: bus_master cap_list
    configuration: driver=ohci1394 latency=64 maxlatency=4 mingnt=2
    resources: irq:16 memory:d0206000-d02067ff memory:d0200000-d0203fff
    I will check the links when I get home.
    Last edited by siabost; September 16th, 2010 at 08:15 AM.

  4. #14
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    Re: Which Realtime Kernel?

    Quote Originally Posted by AutoStatic View Post
    2.6.31-11-rt has been released a while ago. This is a fairly decent realtime kernel and I think it is best to stick with this one.
    I'm kind of retired from the "civilized world" this days so I'm kind of passive about searching for info.

    Great to know that 2.6.31-11-rt is out, I'll give it a try tomorrow. Thanks for the good news

  5. #15
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    Re: Which Realtime Kernel?

    Hiya,

    After further investigation I'm not sure whether to go firewire or USB2 re an external soundcard for my laptop - the hardware list below also shows USB1 so I'm a bit confused as to which I've got i.e. USB1.1 or USB2?
    The speeds quoted at the ffado indicate that my firewire (1394a-2000) is slower than USB2 which I also appear to have.

    How hard is it to find a USB2 standards compliant soundcard for use on Linux?

    Currently with my M-audio MIDI keyboard plugged in via USB & playing live I get a crackle/brief interruption in play while controlling Zynaddsubfx 2.4.0. Is this a function of trying to play it via USB? I don't recall this occurring with a direct MIDI connection via soundcard on a Desktop PC.

    Thanks.

    Edited highlights of
    Code:
    lshw
    description: Computer
    width: 32 bits
    *-core
    description: Motherboard
    physical id: 0
    *-memory
    description: System memory
    physical id: 1
    size: 1381MiB
    *-cpu
    product: Intel(R) Celeron(R) CPU 2.80GHz
    vendor: Intel Corp.
    physical id: 2
    bus info: cpu@0
    version: 15.2.9
    size: 2800MHz
    width: 32 bits
    capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up pebs bts cid xtpr
    configuration: id=0
    *-cache
    description: L1 cache
    physical id: 0
    size: 8KiB
    *-usb:0
    description: USB Controller
    product: OHCI USB Controller #1
    vendor: ATI Technologies Inc
    physical id: 13
    bus info: pci@0000:00:13.0
    version: 01
    width: 32 bits
    clock: 66MHz
    capabilities: bus_master
    configuration: driver=ohci_hcd latency=64
    resources: irq:19 memory:d0001000-d0001fff
    *-usb:1
    description: USB Controller
    product: OHCI USB Controller #2
    vendor: ATI Technologies Inc
    physical id: 13.1
    bus info: pci@0000:00:13.1
    version: 01
    width: 32 bits
    clock: 66MHz
    capabilities: bus_master
    configuration: driver=ohci_hcd latency=64
    resources: irq:19 memory:d0002000-d0002fff
    *-firewire
    description: FireWire (IEEE 1394)
    product: TSB43AB21 IEEE-1394a-2000 Controller (PHY/Link)
    vendor: Texas Instruments
    physical id: 0
    bus info: pci@0000:02:00.0
    version: 00
    width: 32 bits
    clock: 33MHz
    capabilities: bus_master cap_list
    configuration: driver=ohci1394 latency=64 maxlatency=4 mingnt=2
    resources: irq:16 memory:d0206000-d02067ff memory:d0200000-d0203fff
    *-generic UNCLAIMED
    description: System peripheral
    product: PCI1620 Firmware Loading Function
    vendor: Texas Instruments
    physical id: 4.2
    bus info: pci@0000:02:04.2
    version: 01
    width: 32 bits
    clock: 33MHz
    capabilities: bus_master cap_list
    configuration: latency=64 maxlatency=4 mingnt=7
    resources: ioport:a400(size=64)
    *-usb:0
    description: USB Controller
    product: USB
    vendor: NEC Corporation
    physical id: 7
    bus info: pci@0000:02:07.0
    version: 43
    width: 32 bits
    clock: 33MHz
    capabilities: bus_master cap_list
    configuration: driver=ohci_hcd latency=64 maxlatency=42 mingnt=1
    resources: irq:16 memory:d0204000-d0204fff
    *-usb:1
    description: USB Controller
    product: USB
    vendor: NEC Corporation
    physical id: 7.1
    bus info: pci@0000:02:07.1
    version: 43
    width: 32 bits
    clock: 33MHz
    capabilities: bus_master cap_list
    configuration: driver=ohci_hcd latency=64 maxlatency=42 mingnt=1
    resources: irq:18 memory:d0205000-d0205fff
    *-usb:2
    description: USB Controller
    product: USB 2.0
    vendor: NEC Corporation
    physical id: 7.2
    bus info: pci@0000:02:07.2
    version: 04
    width: 32 bits
    clock: 33MHz
    capabilities: bus_master cap_list
    configuration: driver=ehci_hcd latency=64 maxlatency=34 mingnt=16
    resources: irq:19 memory:d0206c00-d0206cff
    *-multimedia
    description: Multimedia audio controller
    product: IXP150 AC'97 Audio Controller
    vendor: ATI Technologies Inc
    physical id: 14.5
    bus info: pci@0000:00:14.5
    version: 00
    width: 32 bits
    clock: 66MHz
    capabilities: bus_master
    configuration: driver=ATI IXP AC97 controller latency=64 mingnt=2
    resources: irq:5 memory:d0003000-d00030ff

  6. #16
    Join Date
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    Re: Which Realtime Kernel?

    Quote Originally Posted by siabost View Post
    After further investigation I'm not sure whether to go firewire or USB2 re an external soundcard for my laptop - the hardware list below also shows USB1 so I'm a bit confused as to which I've got i.e. USB1.1 or USB2?
    The speeds quoted at the ffado indicate that my firewire (1394a-2000) is slower than USB2 which I also appear to have.
    Go FireWire, really, it's much better for audio related things.

    Quote Originally Posted by siabost View Post
    How hard is it to find a USB2 standards compliant soundcard for use on Linux?
    Hard. Afaik only 3 or 4 cards are fully supported.

    Quote Originally Posted by siabost View Post
    Currently with my M-audio MIDI keyboard plugged in via USB & playing live I get a crackle/brief interruption in play while controlling Zynaddsubfx 2.4.0. Is this a function of trying to play it via USB?
    No, that'sthe relatively poor JACK and MIDI support of ZynAddSubFX. You might want to give Yoshimi a try, it's in my PPA. Yoshimi is a ZASFX fork with better JACK support and in the (near) future hopefully better MIDI support too.

  7. #17
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    Re: Which Realtime Kernel?

    Hi AutoStatic,

    Downloaded Yoshimi from your PPA but I'm having a few problems.

    Got the ZASFX instrument banks loaded into it but it crashes as soon as I try to use it's virtual keyboard - it doesn't react with the QUERTY keyboard either.

    Connecting my M-audio MIDI keyboard was difficult too - initially Yoshimi showed only on the "output" side of the Audio Tab in Jack's connection panel. It showed on the "input" side on the MIDI tab & my keyboard on both "input" & "output" sides on the Alsa Tab. Thus I couldn't figure out a way to connect my keyboard to Yoshimi's midi-in.

    Then I changed the MIDI driver in Jack settings from "none" to "raw". This allowed my keyboard to show on the "output" side of the MIDI tab under alsa_pcm and I could make a connection from that to Yoshimi's midi-in.

    When I did though, Yoshimi crashed as soon as I pressed a key.

    Any idea what I'm doing wrong?

    Any help much appreciated.

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