linux-kernel - Re: [PATCH] sched: smart wake-affine

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Date:	Fri, 05 Jul 2013 14:16:25 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
CC:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Alex Shi <alex.shi@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH] sched: smart wake-affine

On 07/05/2013 01:41 PM, Mike Galbraith wrote:
[snip]
>>
>> Have you tried to use more loops and groups? will that show even bigger
>> regressions?
> 
> Nope, less on either side.
> 
> hackbench -g 100 -l 1000
>                                                                        avg
> 3.10.0-regress    21.895    21.564    21.777    21.958    22.093    21.857     1.000
> 3.10.0-regressx   22.844    23.268    23.056    23.231    22.375    22.954     1.050
> 
> hackbench -g 1 -l 100000
>                                                                        avg
> 3.10.0-regress    29.913    29.711    30.395    30.213    30.236    30.093     1.000
> 3.10.0-regressx   30.392    31.003    30.728    31.008    30.389    30.704     1.020

Hmm...I'm not expecting to reserve all of the 15%, but this still seems
a little bit more...

PeterZ has suggested some optimization which I sent out yesterday, I
suppose they haven't been included into this test yet, correct?

Since currently I could not reproduce the issue on my box with that
patch, I suppose it may solved that issue ;-)

Regards,
Michael Wang

> 
>> BTW, is this the results of 10 group and 40 sockets == 400 tasks?
> 
> Yeah, stock.
> 
> Off to do some body/mind tuning.  Bavarian mushrooms don't hide as well
> as memory access thingies.. and I can still out run 'em.
> 
> -Mike 
> 
> 
> 
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