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

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Message-Id: <1256556796.2521.38.camel@sbs-t61>
Date:	Mon, 26 Oct 2009 03:33:16 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] sched: Disable affine wakeups by default

On Mon, 2009-10-26 at 00:05 -0700, Arjan van de Ven wrote:
> On Mon, 26 Oct 2009 08:01:12 +0100
> Ingo Molnar <mingo@...e.hu> wrote:
> 
> > 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..

In the default performance mode, multi-core domain is populated with
only cores sharing last-level cache. In the case where the cores don't
share caches, we represent them in the smp domain.

thanks,
suresh

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