linux-kernel - Re: [RFCv4 PATCH 00/34] sched: Energy cost model for energy-aware scheduling

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Date:	Tue, 12 May 2015 15:07:26 -0700
From:	Sai Gurrappadi <sgurrappadi@...dia.com>
To:	Morten Rasmussen <morten.rasmussen@....com>,
	<peterz@...radead.org>, <mingo@...hat.com>
CC:	<vincent.guittot@...aro.org>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	<yuyang.du@...el.com>, <preeti@...ux.vnet.ibm.com>,
	<mturquette@...aro.org>, <rjw@...ysocki.net>,
	Juri Lelli <Juri.Lelli@....com>, <pang.xunlei@....com.cn>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	Peter Boonstoppel <pboonstoppel@...dia.com>
Subject: Re: [RFCv4 PATCH 00/34] sched: Energy cost model for energy-aware
 scheduling


On 05/12/2015 12:38 PM, Morten Rasmussen wrote:
> Test results for ARM TC2 (2xA15+3xA7) with cpufreq enabled:
> 
> sysbench: Single task running for 3 seconds.
> rt-app [4]: mp3 playback use-case model
> rt-app [4]: 5 ~[6,13,19,25,31,38,44,50]% periodic (2ms) tasks
> 
> Note: % is relative to the capacity of the fastest cpu at the highest
> frequency, i.e. the more busy ones do not fit on little cpus.
> 
> A newer version of rt-app was used which supports a better but slightly
> different way of modelling the periodic tasks. Numbers are therefore
> _not_ comparable to the RFCv3 numbers.
> 
> Average numbers for 20 runs per test (ARM TC2).
> 
> Energy		Mainline	EAS		noEAS
> 
> sysbench	100		251*		227*
> 
> rt-app mp3	100		63		111
> 
> rt-app 6%	100		42		102
> rt-app 13%	100		58		101
> rt-app 19%	100		87		101
> rt-app 25%	100		94		104
> rt-app 31%	100		93		104
> rt-app 38%	100		114		117
> rt-app 44%	100		115		118
> rt-app 50%	100		125		126

Hi Morten,

What is noEAS? From the numbers, noEAS != Mainline?

Maybe also have some perf numbers to show that perf is in fact preserved
while lowering power.

-Sai

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