linux-kernel - Re: [patch v4 0/18] sched: simplified fork, release load avg and power awareness scheduling

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Date:	Tue, 29 Jan 2013 09:36:50 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Borislav Petkov <bp@...en8.de>, Mike Galbraith <efault@....de>,
	torvalds@...ux-foundation.org, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, pjt@...gle.com,
	namhyung@...nel.org, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [patch v4 0/18] sched: simplified fork, release load avg and
 power awareness scheduling


> Benchmark       Version Machine Run Date
> AIM Multiuser Benchmark - Suite VII     "1.1"   performance     Jan 28 08:09:20 2013
> 
> Tasks   Jobs/Min        JTI     Real    CPU     Jobs/sec/task
> 1       438.8           100     13.8    3.8     7.3135
> 5       2634.8          99      11.5    7.2     8.7826
> 10      5396.3          99      11.2    11.4    8.9938
> 20      10725.7         99      11.3    24.0    8.9381
> 40      20183.2         99      12.0    38.5    8.4097
> 80      35620.9         99      13.6    71.4    7.4210
> 160     57203.5         98      16.9    137.8   5.9587
> 320     81995.8         98      23.7    271.3   4.2706
> 
> then the above no_node-load_balance thing suffers a small-ish dip at 320
> tasks, yeah.
> 
> And AFAICR, the effect of disabling boosting will be visible in the
> small count tasks cases anyway because if you saturate the cores with
> tasks, the boosting algorithms tend to get the box out of boosting for
> the simple reason that the power/perf headroom simply disappears due to
> the SOC being busy.

Sure. and according to the context of serial email. guess this result
has boosting enabled, right?


> 
>> 640     100294.8        98      38.7    570.9   2.6118
>> 1280    115998.2        97      66.9    1132.8  1.5104
>> 2560    125820.0        97      123.3   2256.6  0.8191
> 
> I dunno about those. maybe this is expected with so many tasks or do we
> want to optimize that case further?
> 


-- 
Thanks Alex
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