linux-kernel - Re: [PATCH v3 4/6] add a new scheduler hook for context switch

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Message-ID: <4FC60DB8.70405@parallels.com>
Date:	Wed, 30 May 2012 16:08:24 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	<devel@...nvz.org>, Paul Turner <pjt@...gle.com>,
	Tejun Heo <tj@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	<handai.szj@...il.com>, <Andrew.Phillips@...x.com>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH v3 4/6] add a new scheduler hook for context switch

On 05/30/2012 03:40 PM, Peter Zijlstra wrote:
> On Wed, 2012-05-30 at 13:20 +0200, Peter Zijlstra wrote:
>>
>> $ perf stat -e cycles --repeat 100 perf bench sched messaging -p -g 100
>>
>>      48,826,146,710 cycles  #    2.470 GHz  ( +-  0.17% )
>>         2.149005270 seconds time elapsed    ( +-  0.12% )
>
> A repeat count of 250 dropped it down to:
>
>          2.144582157 seconds time elapsed    ( +-  0.08% )
>
> Also, if you're poking at the context switch path, something like:
>
> $ taskset 1 perf stat -e cycles --repeat 10 perf bench sched pipe -l 100000
>
> gives a good number and is usually more stable than hackbench.
thanks for the pointers

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