Re: Horrendous Audio Stutter - current git

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From: Frans Pop
Date: Friday, May 2, 2008 - 11:53 am

On Friday 02 May 2008, Frans Pop wrote:

I have just tested a kernel with GROUP_SCHED enabled (with Peter's patch 
still included) and can confirm that enabling group scheduling causes 
serious latencies.
Skips are much more frequent than with the issue that was just solved.

latencytop shows (different samples)
Scheduler: waiting for cpu                        537.7 msec
Scheduler: waiting for cpu                        172.0 msec 
Scheduler: waiting for cpu                        414.6 msec
Scheduler: waiting for cpu                        455.7 msec
Scheduler: waiting for cpu                        446.5 msec

I think I also see why....

# grep bonus_max `grep -l amarokapp /proc/*/task/*/sched`
/proc/4725/task/20645/sched:se.bonus_max  :        122640.203776
/proc/4725/task/4725/sched:se.bonus_max  :        122640.203776
/proc/4725/task/4793/sched:se.bonus_max  :      41902109.884416
/proc/4725/task/4797/sched:se.bonus_max  :      41902109.884416
/proc/4725/task/4798/sched:se.bonus_max  :      41902109.884416
/proc/4725/task/4799/sched:se.bonus_max  :         40880.046080
/proc/4725/task/4800/sched:se.bonus_max  :            19.970683
--
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Messages in current thread:
Horrendous Audio Stutter - current git, Parag Warudkar, (Thu May 1, 5:14 pm)
Re: Horrendous Audio Stutter - current git, Peter Zijlstra, (Fri May 2, 1:34 am)
Re: 'global' rq->clock, Arjan van de Ven, (Fri May 2, 3:09 am)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Fri May 2, 3:32 am)
Re: Horrendous Audio Stutter - current git, Peter Zijlstra, (Fri May 2, 3:35 am)
Re: Horrendous Audio Stutter - current git, Peter Zijlstra, (Fri May 2, 4:08 am)
Re: Horrendous Audio Stutter - current git, Parag Warudkar, (Fri May 2, 4:10 am)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Fri May 2, 4:37 am)
Re: Horrendous Audio Stutter - current git, Peter Zijlstra, (Fri May 2, 4:39 am)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Fri May 2, 4:45 am)
Re: Horrendous Audio Stutter - current git, Peter Zijlstra, (Fri May 2, 4:51 am)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Fri May 2, 5:06 am)
Re: Horrendous Audio Stutter - current git, Mike Galbraith, (Fri May 2, 5:09 am)
Re: Horrendous Audio Stutter - current git, Parag Warudkar, (Fri May 2, 5:21 am)
Re: Horrendous Audio Stutter - current git, Parag Warudkar, (Fri May 2, 5:22 am)
Re: Horrendous Audio Stutter - current git, Mike Galbraith, (Fri May 2, 5:37 am)
Re: Horrendous Audio Stutter - current git, Dhaval Giani, (Fri May 2, 6:21 am)
Re: Horrendous Audio Stutter - current git, Mike Galbraith, (Fri May 2, 8:02 am)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Fri May 2, 8:49 am)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Fri May 2, 11:53 am)
Re: Horrendous Audio Stutter - current git, Mike Galbraith, (Fri May 2, 12:27 pm)
Re: Horrendous Audio Stutter - current git, Mike Galbraith, (Fri May 2, 12:38 pm)
Re: 'global' rq->clock, David Miller, (Fri May 2, 2:48 pm)
Re: 'global' rq->clock, David Miller, (Fri May 2, 3:00 pm)
Re: 'global' rq->clock, Peter Zijlstra, (Fri May 2, 3:07 pm)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Sat May 3, 12:13 am)
Re: Horrendous Audio Stutter - current git, Mike Galbraith, (Sat May 3, 12:39 am)
Re: 'global' rq->clock, Ingo Molnar, (Sat May 3, 1:28 am)
Re: 'global' rq->clock, David Miller, (Sat May 3, 2:05 am)
Re: 'global' rq->clock, Ingo Molnar, (Sat May 3, 3:10 am)
Re: 'global' rq->clock, David Miller, (Sat May 3, 12:27 pm)
Re: 'global' rq->clock, David Miller, (Sat May 3, 12:28 pm)
Re: 'global' rq->clock, Ingo Molnar, (Sat May 3, 12:37 pm)
Re: 'global' rq->clock, Ingo Molnar, (Sat May 3, 12:39 pm)
Re: 'global' rq->clock, Benjamin Herrenschmidt, (Sat May 3, 3:30 pm)
Re: 'global' rq->clock, Ingo Molnar, (Sat May 3, 3:38 pm)
Re: 'global' rq->clock, David Miller, (Sat May 3, 4:04 pm)
Re: 'global' rq->clock, David Miller, (Sat May 3, 4:36 pm)
Re: 'global' rq->clock, Ingo Molnar, (Sat May 3, 4:38 pm)
Re: 'global' rq->clock, David Miller, (Sat May 3, 4:40 pm)
Re: 'global' rq->clock, Ingo Molnar, (Sat May 3, 4:47 pm)
Re: 'global' rq->clock, Benjamin Herrenschmidt, (Sat May 3, 7:22 pm)
Re: 'global' rq->clock, Peter Zijlstra, (Sun May 4, 5:12 am)
Re: Horrendous Audio Stutter - current git, Frans Pop, (Wed May 7, 1:26 am)
Re: Horrendous Audio Stutter - current git, Ingo Molnar, (Wed May 7, 1:32 am)