linux-kernel - Re: Horrendous Audio Stutter

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Date:	Fri, 2 May 2008 12:32:09 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Peter Zijlstra <a.p.zijlstra@...llo.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 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

# echo NO_NEW_FAIR_SLEEPERS >sched_features

=> no skips in music

/proc/26357/task/26357/sched:se.bonus_max  :         0.000000
/proc/26357/task/26362/sched:se.bonus_max  :         0.000000
/proc/26357/task/26366/sched:se.bonus_max  :         0.000000
/proc/26357/task/26367/sched:se.bonus_max  :         0.000000
/proc/26357/task/26368/sched:se.bonus_max  :         0.000000
/proc/26357/task/26369/sched:se.bonus_max  :         0.000000
/proc/26357/task/9705/sched:se.bonus_max   :         0.000000

# echo NEW_FAIR_SLEEPERS >sched_features
# echo NO_NORMALIZED_SLEEPER >sched_features

=> no skips in music

/proc/13352/task/13352/sched:se.bonus_max  :         0.000000
/proc/13352/task/13357/sched:se.bonus_max  :         0.000000
/proc/13352/task/13361/sched:se.bonus_max  :         0.000000
/proc/13352/task/13362/sched:se.bonus_max  :         0.000000
/proc/13352/task/13363/sched:se.bonus_max  :         0.000000
/proc/13352/task/13364/sched:se.bonus_max  :         0.000000
/proc/13352/task/27595/sched:se.bonus_max  :         0.000000

Cheers,
FJP
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