Re: [RFCv7 PATCH 00/10] sched: scheduler-driven CPU frequency selection

From	Yuyang Du <yuyang.du@intel.com>
Newsgroups	linux.kernel
Subject	Re: [RFCv7 PATCH 00/10] sched: scheduler-driven CPU frequency selection
Date	2016-03-31 06:10 +0200
Message-ID	<riC5I-7Ho-1@gated-at.bofh.it> (permalink)
References	<r59Xz-6rQ-1@gated-at.bofh.it> <rijFN-2CP-21@gated-at.bofh.it> <rizKx-5GC-13@gated-at.bofh.it>
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Hi Steve,

On Wed, Mar 30, 2016 at 06:35:23PM -0700, Steve Muckle wrote:
> This series was dropped in favor of Rafael's schedutil. But on the
> chance that you're still curious about the test setup used to quantify
> the series I'll explain below.
 
I will catch up and learn both.

> These results are meant to show how the governors perform across varying
> workload intensities and periodicities. Higher overhead (OH) numbers
> indicate that the completion times of each period of the workload were
> closer to what they would be when run at fmin (100% overhead would be as
> slow as fmin, 0% overhead would be as fast as fmax). And as described
> above, overruns (OR) indicate that the governor was not responsive
> enough to finish the work in each period of the workload.
> 
> These are just performance metrics so they only tell half the story.
> Power is not factored in at all.
> 
> This provides a quick sanity check that the governor under test (in this
> case, the now defunct schedfreq, or sched for short) performs similarly
> to two of the most commonly used governors, ondemand and interactive, in
> steady state periodic workloads. In the data above sched looks good for
> the most part with the second test case being the biggest exception.
 
Yes, it is indeed a quick sanity check.

Thanks,
Yuyang

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Re: [RFCv7 PATCH 00/10] sched: scheduler-driven CPU frequency  selection Yuyang Du <yuyang.du@intel.com> - 2016-03-30 10:30 +0200
  Re: [RFCv7 PATCH 00/10] sched: scheduler-driven CPU frequency  selection Steve Muckle <steve.muckle@linaro.org> - 2016-03-31 03:40 +0200
    Re: [RFCv7 PATCH 00/10] sched: scheduler-driven CPU frequency  selection Yuyang Du <yuyang.du@intel.com> - 2016-03-31 06:10 +0200

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