linux-kernel - Re: Horrendous Audio Stutter

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Message-ID: <20080507083258.GB22821@elte.hu>
Date:	Wed, 7 May 2008 10:32:58 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frans Pop <elendil@...net.nl>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Parag Warudkar <parag.warudkar@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Mike Galbraith <efault@....de>
Subject: Re: Horrendous Audio Stutter - current git


* Frans Pop <elendil@...net.nl> wrote:

> On Friday 02 May 2008, Peter Zijlstra wrote:
> > > Under kernel compilation load (make -j8) audio is very much unusable
> > > on current linux-2.6.git - The stutter is so bad I can hardly tell
> > > what song I am listening to :)
> > > Even with make -j4 it still skips but not that badly.
> 
> What's the current status here?
> With mainline v2.6.26-rc1-110-ga153063 (which has latest sched 
> patches), I still get very bad audio skips with GROUP_SCHED enabled.

there's no solution for now, the latency targets are still not working 
under the group scheduler. Upstream we've made it non-default and marked 
it EXPERIMENTAL.

Peter has a new updated group scheduler queue that i'm testing right 
now, perhaps it can be pushed out to sched-devel/latest later today. But 
that is v2.6.27 material.

	Ingo
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