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 13:51:14 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Mike Galbraith <efault@....de>
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 01/28/2013 01:17 PM, Mike Galbraith wrote:
> 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]#

similar with aim7 results. Thanks, Mike!

Wold you like to collect vmstat info in background?
> 
> Zzzt.  Wish I could turn turbo thingy off.

Do you mean the turbo mode of cpu frequency? I remember some of machine
can disable it in BIOS.
> 
> -Mike
> 


-- 
Thanks Alex
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