linux-kernel - Re: [Bug #10640] audio skipping on 2.6.26-rc1

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Message-Id: <E1Jvdkw-0007pk-9i@pomaz-ex.szeredi.hu>
Date:	Mon, 12 May 2008 21:32:18 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	rjw@...k.pl
CC:	mingo@...e.hu, parag.warudkar@...il.com,
	linux-kernel@...r.kernel.org, miklos@...redi.hu
Subject: Re: [Bug #10640] audio skipping on 2.6.26-rc1

> > 
> > * Parag Warudkar <parag.warudkar@...il.com> wrote:
> > 
> > > Rafael J. Wysocki <rjw <at> sisk.pl> writes:
> > > 
> > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=10640
> > > > Subject		: audio skipping on 2.6.26-rc1
> > > > Submitter	: Miklos Szeredi <miklos <at> szeredi.hu>
> > > > Date		: 2008-05-07 7:56 (5 days old)
> > > > References	: http://marc.info/?l=linux-kernel&m=121014707707781&w=2
> > > > Handled-By	: Ingo Molnar <mingo <at> elte.hu>
> > > 
> > > This is a duplicate of [Bug #10616] Horrendous Audio Stutter - current 
> > > git .
> > 
> > that should be resolved via your patch which i pushed upstream (commit 
> > v2.6.26-rc1-83-gaac6abc), which marks group scheduling experimental and 
> > non-default.
> > 
> > i think the audio skipping from Miklos, if it does not go away with 
> > disabling group scheduling, might also be solved by:
> > 
> >  - commit v2.6.26-rc1-181-g4615112 ("sched: fix weight calculations") 
> >    from Mike.
> > 
> >  - or by commit v2.6.26-rc1-82-g3e51f33 from Peter ("sched: add optional 
> >    support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK") which makes the 
> >    scheduler clock more reliable [and hence produce no artificial 
> >    latencies] on NOHZ
> > 
> >  - or by commit v2.6.26-rc1-66-ga992241 from Peter ("sched: fix 
> >    normalized sleeper").
> 
> Miklos, can you please verify if the problem is present in 2.6.26-rc2?

Yep, disabling group sched fixed it.

Miklos
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