Results 1 to 4 of 4

Thread: Realtime-kernel and multiuser-environment

  1. #1
    Join Date
    Apr 2010
    Beans
    114
    Distro
    Ubuntu Studio 10.04 Lucid Lynx

    Realtime-kernel and multiuser-environment

    Hi!
    What's the thing about realtime-kernel and multiuser-environment.
    Is this why I get a black screen when switching user?
    Do I have to run realtime-kernel for Jack?

    (My system tells me I'm using "Kernel Linux 2.6.32-21-generic". So, I'm not running realtimekernel now?)

    Thanks!

  2. #2
    Join Date
    Mar 2006
    Beans
    308
    Distro
    Ubuntu Studio 12.04 Precise Pangolin

    Re: Realtime-kernel and multiuser-environment

    Quote Originally Posted by G-Sun View Post
    Hi!
    What's the thing about realtime-kernel and multiuser-environment.
    Is this why I get a black screen when switching user?
    Do I have to run realtime-kernel for Jack?

    (My system tells me I'm using "Kernel Linux 2.6.32-21-generic". So, I'm not running realtimekernel now?)

    Thanks!
    Then you are using the standard kernel. As for Jack I'll the more expert people answer that.

  3. #3
    Join Date
    Dec 2006
    Beans
    1,540

    Re: Realtime-kernel and multiuser-environment

    Hi, a kernel with RT or PREEMPT in the name indicate it will perform
    better in critical audio situations, when the system is configured to use it. jackd does not rquire them, but will benefit.

    You can get an idea what your current limits will be with
    a good old torture test:
    load zynaddsubfx, and begin enabling its
    16 multi-timbral parts. (look right above the 'Edit Instrument' button, the number 1 and a tick-marked 'enable' change this to 2, and retick the enable box, and on the right of the screen, change the midi channels all to 1 as you go, to hear all the instruments, and keep loading more...Pick a sound you like, play a 6 or more finger chord, and hold the sustain pedal, add sound 2, and repeat the chord-sustain, before long, you'll see where things max out.

    Another torture is to get the gscw drumkits for hydrogen, and build an extremely complex rythm to enjoy with the keyboard test

    Add in Rakarrack for each, and you'll also add a little more cpu
    stress.

    Doing the same test with an RT kernel will let you go much deeper before
    maximum sound is achieved, and I suspect the PREEMPT kernels are similar,
    I've been using one for a week now, and have no complaints.

    Sometimes when a 3D driver is installed, and multiple kernels are installed, and the video only works on the kernel available to it when it was installed.

    Multi-user, does that mean you and root, or you and root and a 3rd user account? A 3rd user might not be included in the audio group, or other needed groups, just a guess?

    Cheers
    Last edited by sgx; May 2nd, 2010 at 01:17 AM. Reason: spellng

  4. #4
    Join Date
    Apr 2010
    Beans
    114
    Distro
    Ubuntu Studio 10.04 Lucid Lynx

    Re: Realtime-kernel and multiuser-environment

    Quote Originally Posted by sgx View Post

    Multi-user, does that mean you and root, or you and root and a 3rd user account? A 3rd user might not be included in the audio group, or other needed groups, just a guess?
    Cheers
    Thanks a lot!
    Multi-user: Me, root and 3rd user.

    PREEMPT: What's that? Is it for 10.04?

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •