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

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Message-ID: <5182178A.5020607@linux.vnet.ibm.com>
Date:	Thu, 02 May 2013 15:36:42 +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: wake-affine throttle

On 05/02/2013 03:10 PM, Mike Galbraith wrote:
>>
>> I've done the test for several times, also compared with the throttle
>> approach, default 1ms interval still works very well, the regression on
>> hackbench start to exceed 2% when interval become 100ms on my box, but
>> please note the pgbench already gain a lot benefit at that time.
>>
>> I think now we could say that wake-affine is useful, and we could not
>> simply kill it.
> 
> Oh, it's definitely useful.  Communicating tasks deeply resent talking
> over interconnects (advanced tin cans and string).  My little Q6600 box
> can even be described as dinky-numa given enough imagination.. place
> communicating tasks on different core2 "nodes" if you will, throughput
> falls through the floor.  Shared L2 is quick like bunny, dram ain't.

Nice, so we got another proof to defend wake-affine now ;-)

Regards,
Michael Wang

> 
> -Mike
> 
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