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

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [lkp] [sched/fair] e210bffd39: perf-stat.cpu-migrations -36.0% decrease
Date	2016-08-04 11:10 +0200
Message-ID	<s2mP7-6St-3@gated-at.bofh.it> (permalink)
References	<s2jod-4Ab-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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?

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Re: [lkp] [sched/fair]  e210bffd39: perf-stat.cpu-migrations -36.0%  decrease Peter Zijlstra <peterz@infradead.org> - 2016-08-04 11:10 +0200
  Re: [lkp] [sched/fair] e210bffd39: perf-stat.cpu-migrations -36.0% decrease Vincent Guittot <vincent.guittot@linaro.org> - 2016-08-04 11:20 +0200
  Re: [lkp] [sched/fair]  e210bffd39: perf-stat.cpu-migrations -36.0%  decrease Ye Xiaolong <xiaolong.ye@intel.com> - 2016-08-04 16:10 +0200

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