linux-kernel - Re: [patch] CFS (Completely Fair Scheduler), v2

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Date:	Tue, 17 Apr 2007 17:48:33 +0200
From:	Gabriel C <nix.or.die@...glemail.com>
To:	caglar@...dus.org.tr
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [patch] CFS (Completely Fair Scheduler), v2

S.Çağlar Onur wrote:
> 17 Nis 2007 Sal tarihinde, Ingo Molnar şunları yazmıştı: 
>   
>>> Sorry for delayed response but i just find some free time, do you
>>> still want me to test mainline + "parent-runs first" patch or will i
>>> drop that one and test v2 which can change default behaviour?
>>>       
>> i suspect for now it would be sufficient if you could check the v2
>> patch.
>>
>> if it _works_, please try this:
>>
>>     echo 0 > /proc/sys/kernel/sched_child_runs_first
>>
>> this should break Kaffeine again :)
>>
>> (if it doesnt work then the Kaffeine problem is unrelated to
>> child-runs-first.)
>>     
>
> OK, i tested both plain -rc7 and -rc7 + CFSv2 with while 
> sched_child_runs_first enabled/disabled.
>
> I'm always using same video file and try to reproduce freeze with constantly 
> pressing forward/backward buttons. With CFS 2-3 forward/backward attempt 
> reproduces this behaviour. 
>
> And here are the results.
>
> Mainline still has no issues with both xine-lib/kaffeine and xine-ui 
> (kaffeine-0.8.4, xine-lib-1.1.5 [both xcb enabled], xine-ui-0.99.4). I really 
> try hard to reproduce the freeze, but i can't...
>
> And CFSv2 still fails for both child_runs_first and parent_runs_first cases 
> with same strace output (FUTEX_WAIT).
>   

I have the same problem here ( same packages ).

Even VLC if I go forward/backward and then play again its start to 
ramdom freeze here but only for 1 - 2 seconds maybe.


> If you want me to test something else just ask please :) 
>
> Cheers
>   

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