linux-kernel - Re: [lkp] [sched/fair] e210bffd39: perf-stat.cpu-migrations -36.0% decrease

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Message-ID: <CAKfTPtCXf7ZJw2SH-3ogxJf4bOcnZj3i0hH4cHu_jmeEBdbV2Q@mail.gmail.com>
Date:	Thu, 4 Aug 2016 11:05:07 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	kernel test robot <xiaolong.ye@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>
Subject: Re: [lkp] [sched/fair] e210bffd39: perf-stat.cpu-migrations -36.0% decrease

On 4 August 2016 at 11:01, Peter Zijlstra <peterz@...radead.org> wrote:
> On Thu, Aug 04, 2016 at 01:24:23PM +0800, kernel test robot wrote:
>>
>> FYI, we noticed perf-stat.cpu-migrations -36.0% decrease due to commit:
>>
>> commit e210bffd39d01b649c94b820c28ff112673266dd ("sched/fair: Fix and optimize the fork() path")
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>
>> in testcase: unixbench
>> on test machine: 16 threads Broadwell-DE with 8G memory
>> with following parameters:
>>
>>       runtime: 300s
>>       nr_task: 1
>>       test: shell8
>>       cpufreq_governor: performance
>>
>>
>
> Urgh, I so hate these reports. They're near useless :/
>
> It took me 3 readings to realize it was the unixbench testcase (why
> isn't that in the subject!?). But then I still haven't found the primary
> performance metric. Does the test improve, degrade or not change
> overall?

Yes, i have the same question

>
>