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SubjectRe: v2.6.19-rt6, yum/rpm
On Thu, 2006-12-07 at 21:58 +0100, Ingo Molnar wrote:
> * Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU> wrote:
> > Much better performance in terms of xruns with Jackd. Hardly any at
> > all as it should be. I'm starting to test -rt8 right now.
> >
> > Now, I still don't have an smp machine to test so the improvement
> > could be because I'm just running 64 bit up instead of smp. Or it
> > could have been the hardware on that other machine that had some
> > problem (either because it was starting to fail or because the kernel
> > drivers for that hardware were somehow triggering the xruns).
> i think it's the UP vs. SMP difference. We are chasing some SMP
> latencies right now that trigger on boxes that have deeper C sleep
> states. idle=poll seems to work around those problems.

well C-states do cause latencies... as advertized in
the /proc/acpi/processor/CPU0/power file.

You can prevent linux from going into c-states that just take too long,
by setting the latency you can tolerate via the
set_acceptable_latency(). You can see the active maximum latency via the
same power file...

(right now audio playback is the main user of this api; of other parts
should use it too lets talk about it)

if you want to mail me at work (you don't), use arjan (at)
Test the interaction between Linux and your BIOS via

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