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

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Date:	Thu, 16 May 2013 15:29:24 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Alex Shi <alex.shi@...el.com>
CC:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, bp@...en8.de, pjt@...gle.com,
	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 05/10/2013 11:17 PM, Alex Shi wrote:
> This patchset bases on tip/sched/core.
> 
> 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 ;-)

Regards,
Michael Wang

> 
> And Morten tested previous version too.
> http://comments.gmane.org/gmane.linux.kernel/1463371
> 
> Thanks comments from Peter, Paul, Morten, Miacheal and Preeti.
> And more comments are appreciated!
> 
> Regards
> Alex
> 
> [patch v6 1/8] Revert "sched: Introduce temporary FAIR_GROUP_SCHED
> [patch v6 2/8] sched: move few runnable tg variables into CONFIG_SMP
> [patch v6 3/8] sched: set initial value of runnable avg for new
> [patch v6 4/8] sched: fix slept time double counting in enqueue
> [patch v6 5/8] sched: update cpu load after task_tick.
> [patch v6 6/8] sched: compute runnable load avg in cpu_load and
> [patch v6 7/8] sched: consider runnable load average in move_tasks
> [patch v6 8/8] sched: remove blocked_load_avg in tg
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