linux-kernel - Re: [patch] CFS scheduler, -v12

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Message-ID: <464B96DD.2000706@bigpond.net.au>
Date:	Thu, 17 May 2007 09:42:21 +1000
From:	Peter Williams <pwil3058@...pond.net.au>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>, Mark Lord <lkml@....ca>
Subject: Re: [patch] CFS scheduler, -v12

Ingo Molnar wrote:
> * Peter Williams <pwil3058@...pond.net.au> wrote:
> 
>>> As usual, any sort of feedback, bugreport, fix and suggestion is more 
>>> than welcome,
>> Load balancing appears to be badly broken in this version.  When I 
>> started 4 hard spinners on my 2 CPU machine one ended up on one CPU 
>> and the other 3 on the other CPU and they stayed there.
> 
> hm, i cannot reproduce this on 4 different SMP boxen, trying various 
> combinations of SCHED_SMT/MC

You may need to try more than once.  Testing load balancing can be a 
pain as there's always a possibility you'll get a good result just by 
chance.  I.e. you need a bunch of good results to say it's OK but only 
one bad result to say it's broken.   This makes testing load balancing a 
pain.

> and other .config options that might make a 
> difference to balancing. Could you send me your .config?

Sent separately.

Peter
-- 
Peter Williams                                   pwil3058@...pond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce
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