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

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Date:	Tue, 28 May 2013 21:31:06 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>, mingo@...hat.com,
	peterz@...radead.org, pjt@...gle.com
CC:	tglx@...utronix.de, akpm@...ux-foundation.org, bp@...en8.de,
	namhyung@...nel.org, efault@....de, morten.rasmussen@....com,
	vincent.guittot@...aro.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
	mgorman@...e.de, riel@...hat.com
Subject: Re: [patch 0/8]: use runnable load avg in balance

On 05/16/2013 03:29 PM, Michael Wang wrote:
>> > This version changed the runnable load avg value setting for new task
>> > in patch 3rd.
>> > 
>> > We also tried to include blocked load avg in balance. but find many benchmark
>> > performance dropping. Guess the too bigger cpu load drive task to be waken
>> > on remote CPU, and cause wrong decision in periodic balance.
>> > 
>> > I retested on Intel core2, NHM, SNB, IVB, 2 and 4 sockets machines with
>> > benchmark kbuild, aim7, dbench, tbench, hackbench, oltp, and netperf loopback
>> > etc. The performance is better now. 
>> > 
>> > On SNB EP 4 sockets machine, the hackbench increased about 50%, and result
>> > become stable. on other machines, hackbench increased about 2~10%.
>> > oltp increased about 30% in NHM EX box.
>> > netperf loopback also increased on SNB EP 4 sockets box.
>> > no clear changes on other benchmarks.
>> > 
>> > Michael Wang had tested previous version on pgbench on his box:
>> > https://lkml.org/lkml/2013/4/2/1022
> Tested the latest patch set (new 3/8 and 6/8) with pgbench, tip
> 3.10.0-rc1 and 12 cpu X86 box, works well and still benefit ;-)


Paul:

Would you like to give more comments/ideas of this patch set?

-- 
Thanks
    Alex
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