linux-kernel - Re: [tip:sched/core] sched: Disable wakeup balancing

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Message-Id: <1253127000.7166.11.camel@laptop>
Date:	Wed, 16 Sep 2009 20:50:00 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched: Disable wakeup balancing

On Wed, 2009-09-16 at 15:10 +0000, tip-bot for Peter Zijlstra wrote:
> Commit-ID:  182a85f8a119c789610a9d464f4129ded9f3c107
> Gitweb:     http://git.kernel.org/tip/182a85f8a119c789610a9d464f4129ded9f3c107
> Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
> AuthorDate: Wed, 16 Sep 2009 13:24:49 +0200
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Wed, 16 Sep 2009 16:44:33 +0200
> 
> sched: Disable wakeup balancing
> 
> Sysbench thinks SD_BALANCE_WAKE is too agressive and kbuild doesn't
> really mind too much, SD_BALANCE_NEWIDLE picks up most of the
> slack.
> 
> On a dual socket, quad core, dual thread nehalem system:
> 
> sysbench (--num_threads=16):
> 
>  SD_BALANCE_WAKE-: 13982 tx/s
>  SD_BALANCE_WAKE+: 15688 tx/s

I got the + and - confused it seems.. sysbench is faster without
BALANCE_WAKE.

> kbuild (-j16):
> 
>  SD_BALANCE_WAKE-: 47.648295846  seconds time elapsed   ( +-   0.312% )
>  SD_BALANCE_WAKE+: 47.608607360  seconds time elapsed   ( +-   0.026% )


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