Re: 2.6.X, NPTL, SCHED_FIFO and JACK

From: Jakub Jelinek (jakub_at_redhat.com)
Date: 06/30/04

  • Next message: Bartlomiej Zolnierkiewicz: "[PATCH] ide-taskfile.c fixups/cleanups part #2 [3/9]" 
    Date:	Wed, 30 Jun 2004 11:26:52 -0400
To: Ingo Molnar <mingo@elte.hu>

    On Wed, Jun 30, 2004 at 05:04:30PM +0200, Ingo Molnar wrote:
    > > Are there known issues with the implementation of NPTL that might give
    > > rise to this behaviour? What can we do to help understand and debug
    > > it?
    >
    > there's nothing special about NPTL, scheduling-wise. But if SCHED_FIFO
    > is not properly set for all JACK threads that could explain the
    > symptoms. You talked about kludges that are necessary to make all
    > threads SCHED_FIFO - are you 100% sure that all JACK threads are indeed
    > SCHED_FIFO after these kludges are applied? If yes and you are running a
    > later kernel then it's something new and probably NPTL-unrelated.

    One thing to note is that NPTL defaults to PTHREAD_INHERIT_SCHED
    while LinuxThreads defaults to PTHREAD_EXPLICIT_SCHED.
    So, if you care about what scheduling created threads will have
    and want it to work with both NPTL and LinuxThreads, you want
    pthread_attr_setinheritsched (&attr, PTHREAD_*_SCHED);
    explicitely.

            Jakub
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  • Next message: Bartlomiej Zolnierkiewicz: "[PATCH] ide-taskfile.c fixups/cleanups part #2 [3/9]"

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