linux-kernel - Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq

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Date:	Fri, 22 Feb 2013 07:19:31 +0100
From:	Mike Galbraith <efault@....de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>, alex.shi@...el.com,
	Ram Pai <linuxram@...ibm.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq_fair()

On Fri, 2013-02-22 at 14:06 +0800, Michael Wang wrote: 
> On 02/22/2013 01:08 PM, Mike Galbraith wrote:
> > On Fri, 2013-02-22 at 10:37 +0800, Michael Wang wrote:
> > 
> >> According to the testing result, I could not agree this purpose of
> >> wake_affine() benefit us, but I'm sure that wake_affine() is a terrible
> >> performance killer when system is busy.
> > 
> > (hm, result is singular.. pgbench in 1:N mode only?)
> 
> I'm not sure about how pgbench implemented, all I know is it will create
> several instance and access the database, I suppose no different from
> several threads access database (1 server and N clients?).

It's user switchable.

-Mike

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