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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4
On Fri, 29 Oct 2004 23:09:24 -0400, Lee Revell <> wrote:
> On Fri, 2004-10-29 at 16:31 +0200, Florian Schmidt wrote:
> > i tried a V0.5.2 with PREEMPT_REALTIME and all debugging off (config
> > attached). I cannot reproduce your results. I have experienced around 30
> > xruns in 10 minutes. And big ones, too (> 5ms). I don't know exactly what
> > kind of load triggers them. Here's a bit of qjackctl message window (btw:
> > jackd was idle, no clients connected, except for qjackctl):
> >
> I am seeing the same behavior, about 30 xruns in 10 minutes. It seems
> to be triggered by display activity, among other things. This cannot be
> a jackd issue, because with an earlier version (T3) I can run for 24
> hours without a single xrun.
> There has to be a bug somewhere in the RT preempt patch.
> Lee

There is, this has been a well-known issue with many versions of
real-time voluntary preemption, which is also a main reason as to why
I avoid it, voluntary preemption performs flawlessly however RT has
been horrendous. Hopefully the bugs will get smoothed out.
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