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

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Date:	Mon, 28 Jan 2013 06:17:46 +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 16:51 +0100, Mike Galbraith wrote: 
> 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.

monteverdi:/abuild/mike/:[0]# echo powersaving > /sys/devices/system/cpu/sched_policy/current_sched_policy
monteverdi:/abuild/mike/:[0]# massive_intr 10 60
043321  00058616
043313  00058616
043318  00058968
043317  00058968
043316  00059184
043319  00059192
043320  00059048
043314  00059048
043312  00058176
043315  00058184
monteverdi:/abuild/mike/:[0]# echo balance > /sys/devices/system/cpu/sched_policy/current_sched_policy
monteverdi:/abuild/mike/:[0]# massive_intr 10 60
043337  00053448
043333  00053456
043338  00052992
043331  00053448
043332  00053488
043335  00053496
043334  00053480
043329  00053288
043336  00053464
043330  00053496
monteverdi:/abuild/mike/:[0]# echo performance > /sys/devices/system/cpu/sched_policy/current_sched_policy
monteverdi:/abuild/mike/:[0]# massive_intr 10 60
043348  00052488
043344  00052488
043349  00052744
043343  00052504
043347  00052504
043352  00052888
043345  00052504
043351  00052496
043346  00052496
043350  00052304
monteverdi:/abuild/mike/:[0]#

Zzzt.  Wish I could turn turbo thingy off.

-Mike

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