linux-kernel - Re: [patch v3 0/8] sched: use runnable avg in load balance

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Message-ID: <515AA13A.5090709@linux.vnet.ibm.com>
Date:	Tue, 02 Apr 2013 17:13:30 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
CC:	Alex Shi <alex.shi@...el.com>, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, morten.rasmussen@....com,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, len.brown@...el.com,
	rafael.j.wysocki@...el.com, jkosina@...e.cz,
	clark.williams@...il.com, tony.luck@...el.com,
	keescook@...omium.org, mgorman@...e.de, riel@...hat.com
Subject: Re: [patch v3 0/8] sched: use runnable avg in load balance

On 04/02/2013 04:34 PM, Mike Galbraith wrote:
[snip]
>> The reason may caused by wake_affine()'s higher overhead, and pgbench is
>> really sensitive to this stuff...
> 
> For grins, you could try running the whole thing SCHED_BATCH.  (/me sees
> singing/dancing red herring whenever wake_affine() and pgbench appear in
> the same sentence;)

I saw the patch touched the wake_affine(), just interested on what will
happen ;-)

The patch changed the overhead of wake_affine(), and also influence it's
result, I used to think the later one may do some help to the pgbench...

Regards,
Michael Wang

> 
> -Mike
> 

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