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 05:03:33 +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 Tue, 2013-01-29 at 09:45 +0800, Alex Shi wrote: 
> On 01/28/2013 11:47 PM, Mike Galbraith wrote:

> > monteverdi:/abuild/mike/:[0]# echo 1 > /sys/devices/system/cpu/cpufreq/boost
> > monteverdi:/abuild/mike/:[0]# massive_intr 10 60
> > 014635  00058160
> > 014633  00058592
> > 014638  00058592
> > 014636  00058160
> > 014632  00058200
> > 014634  00058704
> > 014639  00058704
> > 014641  00058200
> > 014640  00058560
> > 014637  00058560
> > monteverdi:/abuild/mike/:[0]# massive_intr 10 60
> > 014673  00059504
> > 014676  00059504
> > 014674  00059064
> > 014672  00059064
> > 014675  00058560
> > 014671  00058560
> > 014677  00059248
> > 014668  00058864
> > 014669  00059248
> > 014670  00058864
> > monteverdi:/abuild/mike/:[0]# massive_intr 10 60
> > 014686  00043472
> > 014689  00043472
> > 014685  00043760
> > 014690  00043760
> > 014687  00043528
> > 014688  00043528  (hmm)
> > 014683  00043216
> > 014692  00043208
> > 014684  00043336
> > 014691  00043336
> 
> I am sorry Mike. does above 3 times testing has a same sched policy? and
> same question for the following testing.

Yeah, they're back to back repeats.  Using dirt simple massive_intr
didn't help clarify aim7 oddity.

aim7 is fully repeatable, seems to be saying that consolidation of small
independent jobs is a win, that spreading before fully saturated has its
price, just as consolidation of large coordinated burst has its price.

Seems to cut both ways.. but why not, everything else does.

-Mike

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