Messages in this thread | | | Subject | Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4] | From | Lee Revell <> | Date | Sat, 30 Oct 2004 13:49:29 -0400 |
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On Sat, 2004-10-30 at 13:58 +0200, Ingo Molnar wrote: > * Lee Revell <rlrevell@joe-job.com> wrote: > > > Here is the dmesg output. It looks like the problem could be related > > to jackd's printing from the realtime thread. But, this has to be the > > kernel's fault on some level, because with an earlier version I get no > > xruns. > > with the earlier version these spinlocks were simply disabling > preemption, while now they will schedule away on contention. If that tty > lock is held for a long time by a lowprio task then that could delay the > highprio thread. We are starting to see priority inversion problems. > But, the core issue is doing tty printouts - does jackd do that > periodically, or only as a reaction to an already existing latency? >
No, this cannot be the whole story, because unless verbose mode is specified, jackd will only prints anything if there is an xrun. So there is something else going on.
This _really_ feels like a kernel bug. Are you saying that this could still be a jackd problem, even though T3 works perfectly with the exact same jackd binary?
Lee
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