linux-kernel - Re: Horrendous Audio Stutter

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Date:	Fri, 02 May 2008 13:08:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frans Pop <elendil@...net.nl>
Cc:	Parag Warudkar <parag.warudkar@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Horrendous Audio Stutter - current git

On Fri, 2008-05-02 at 12:35 +0200, Peter Zijlstra wrote:
> On Fri, 2008-05-02 at 12:32 +0200, Frans Pop wrote:
> > On Friday 02 May 2008, Peter Zijlstra wrote:
> > > So by default we have both enabled; could you report if either
> > > NO_NEW_FAIR_SLEEPERS
> > > NEW_FAIR_SLEEPERS + NO_NORMALIZED_SLEEPERS
> > > works for you?
> > 
> > Both work for me. Tested with current git head (mainline) + your patch.
> > 
> > > Also, could you apply this patch, and report the bonus_max value for
> > > your music player under all three scenarios?
> > 
> > I've restarted amarok and the glibc build each time after change to 
> > sched_features.
> > 
> > # cat sched_features
> > NEW_FAIR_SLEEPERS WAKEUP_PREEMPT START_DEBIT AFFINE_WAKEUPS CACHE_HOT_BUDDY 
> > SYNC_WAKEUPS HRTICK NO_DOUBLE_TICK NORMALIZED_SLEEPER DEADLINE
> > 
> > => skips in music (amarok)
> > 
> > /proc/20734/task/20734/sched:se.bonus_max  :     40960.000000
> > /proc/20734/task/20775/sched:se.bonus_max  :     40960.000000
> > /proc/20734/task/20779/sched:se.bonus_max  :     40960.000000
> > /proc/20734/task/20780/sched:se.bonus_max  :     40960.000000
> > /proc/20734/task/20781/sched:se.bonus_max  :     40960.000000
> > /proc/20734/task/20782/sched:se.bonus_max  :        39.960966
> > /proc/20734/task/20799/sched:se.bonus_max  :     40960.000000
> 
> Ok, that's _WAY_ too big, something went seriously wrong. Thanks!

In fact, that is exactly 1024 time too large.

How does this work for you:

Index: linux-2.6-2/kernel/sched_fair.c
===================================================================
--- linux-2.6-2.orig/kernel/sched_fair.c
+++ linux-2.6-2/kernel/sched_fair.c
@@ -685,6 +685,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, st
 	 * Update run-time statistics of the 'current'.
 	 */
 	update_curr(cfs_rq);
+	account_entity_enqueue(cfs_rq, se);
 
 	if (wakeup) {
 		place_entity(cfs_rq, se, 0);
@@ -695,7 +696,6 @@ enqueue_entity(struct cfs_rq *cfs_rq, st
 	check_spread(cfs_rq, se);
 	if (se != cfs_rq->curr)
 		__enqueue_entity(cfs_rq, se);
-	account_entity_enqueue(cfs_rq, se);
 }
 
 static void update_avg(u64 *avg, u64 sample)


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