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

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Date:	Wed, 30 Mar 2016 08:45:06 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Steve Muckle <steve.muckle@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Juri Lelli <Juri.Lelli@....com>,
	Patrick Bellasi <patrick.bellasi@....com>,
	Michael Turquette <mturquette@...libre.com>
Subject: Re: [RFCv7 PATCH 00/10] sched: scheduler-driven CPU frequency
 selection

Hi Steve,

On Mon, Feb 22, 2016 at 05:22:40PM -0800, Steve Muckle wrote:
> The number of times the busy
> duration exceeds the period of the periodic workload (an "overrun") is
> also recorded.

Could you please explain more about overrun?

> SCHED_OTHER workload:
>  wload parameters	  ondemand        interactive     sched	
> run	period	loops	OR	OH	OR	OH	OR	OH
> 1	100	100	0	62.07%	0	100.02%	0	78.49%
> 10	1000	10	0	21.80%	0	22.74%	0	72.56%
> 1	10	1000	0	21.72%	0	63.08%	0	52.40%
> 10	100	100	0	8.09%	0	15.53%	0	17.33%
> 100	1000	10	0	1.83%	0	1.77%	0	0.29%
> 6	33	300	0	15.32%	0	8.60%	0	17.34%
> 66	333	30	0	0.79%	0	3.18%	0	12.26%
> 4	10	1000	0	5.87%	0	10.21%	0	6.15%
> 40	100	100	0	0.41%	0	0.04%	0	2.68%
> 400	1000	10	0	0.42%	0	0.50%	0	1.22%
> 5	9	1000	2	3.82%	1	6.10%	0	2.51%
> 50	90	100	0	0.19%	0	0.05%	0	1.71%
> 500	900	10	0	0.37%	0	0.38%	0	1.82%
> 9	12	1000	6	1.79%	1	0.77%	0	0.26%
> 90	120	100	0	0.16%	1	0.05%	0	0.49%
> 900	1200	10	0	0.09%	0	0.26%	0	0.62%
 
Could you please also explain what we can learn from the wload vs. OH/OR
results?

Or if you have already explained these questions before, could you please
point to the links? Thank you.

Yuyang