linux-kernel - Re: [rfc][patch] select_idle_sibling() inducing bouncing on westmere

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Message-ID: <1337926468.5415.48.camel@marge.simpson.net>
Date:	Fri, 25 May 2012 08:14:28 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Paul Turner <pjt@...gle.com>,
	Arjan Van De Ven <arjan@...ux.intel.com>
Subject: Re: [rfc][patch] select_idle_sibling() inducing bouncing on westmere

On Thu, 2012-05-24 at 15:20 +0200, Peter Zijlstra wrote: 
> On Thu, 2012-05-24 at 15:17 +0200, Peter Zijlstra wrote:
> > For power7 with 4 smt it would end up as 1230 I guess.
> 
> One more thing, in light of that, can't you simplify the core stuff to
> be a simple shift as well? map them 123450, does it really matter to
> pair them off like 103254 ?

In my head it does.  Buddies need to be glued together so we can use
them as a team to convert overlap and kick butt on ramp up.

-Mike

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