Re: [patch] voluntary-preempt-2.6.8-rc3-O5

Lee Revell
2004-08-13T01:11:44Z

On Thu, 2004-08-12 at 21:18, Florian Schmidt wrote:
> On Thu, 12 Aug 2004 20:55:30 -0400
> Lee Revell <rlrevell@joe-job.com> wrote:
>
> > Even if it is not a long non-preemptible section, mlockall-test is
> > still doing *something* that causes an xrun in jackd. Maybe
> > interrupts are being disabled for a long time. Whatever it is, it
> > cannot possibly be a jackd bug, because mlockall by an unrelated,
> > normal-priority process causes an xrun in the SCHED_FIFO jackd
> > process.
>
> Hmm, yes, that makes sense. I wonder: does mlockall have any influence
> on IPC?
>

Good question. I did repeat your test (disabling xrun_debug) and I can
confirm that I no longer get a preempt timing violation, but
mlockall-test still triggers xruns in jackd every time. So there is
something else going on here.

Lee