linux-kernel - Re: [PATCH 3/3] sched: Disable affine wakeups by default

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Message-ID: <20091026000517.723f7550@infradead.org>
Date:	Mon, 26 Oct 2009 00:05:17 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] sched: Disable affine wakeups by default

On Mon, 26 Oct 2009 08:01:12 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Mike Galbraith <efault@....de> wrote:
> 
> > On Mon, 2009-10-26 at 06:47 +0100, Mike Galbraith wrote:
> > > On Sun, 2009-10-25 at 22:36 -0700, Arjan van de Ven wrote:
> > 
> > > > if you're a multicore domain you better have a shared cache.. 
> > > > that's what it should mean. If it does not we should fix that.
> > > 
> > > Sounds reasonable to me.  I'll go make explosions.
> > 
> > (Actually, if multicode and sibling does indeed mean shared cache,
> > no arch tinkering should be necessary, just reset SD_WAKE_AFFINE
> > when degenerating should work fine.  Only thing is multicore with 
> > siblings.. and test test test)
> 
> Correct. There's a few cpus where multicore means separate caches but 
> all modern CPUs have shared caches for cores so we want to tune for 
> that.

for those cpus where mc means separate caches we should fix the arch
code to set up separate MC domains to be honest..
I can look into that in a bit..


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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