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

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Date:	Sun, 27 Jan 2013 16:51:43 +0100
From:	Mike Galbraith <efault@....de>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Borislav Petkov <bp@...en8.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

On Sun, 2013-01-27 at 21:25 +0800, Alex Shi wrote: 
> On 01/27/2013 06:35 PM, Borislav Petkov wrote:
> > On Sun, Jan 27, 2013 at 05:36:25AM +0100, Mike Galbraith wrote:
> >> With aim7 compute on 4 node 40 core box, I see stable throughput
> >> improvement at tasks = nr_cores and below w. balance and powersaving. 
... 
> > Ok, this is sick. How is balance and powersaving better than perf? Both
> > have much more jobs per minute than perf; is that because we do pack
> > much more tasks per cpu with balance and powersaving?
> 
> Maybe it is due to the lazy balancing on balance/powersaving. You can
> check the CS times in /proc/pid/status.

Well, it's not wakeup path, limiting entry frequency per waker did zip
squat nada to any policy throughput.

-Mike

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