linux-kernel - Re: sched: Avoid SMT siblings in select_idle

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Message-ID: <1329802998.7333.1.camel@marge.simpson.net>
Date:	Tue, 21 Feb 2012 06:43:18 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible

On Mon, 2012-02-20 at 20:07 +0100, Peter Zijlstra wrote: 
> On Mon, 2012-02-20 at 19:14 +0100, Mike Galbraith wrote:
> > Enabling SD_BALANCE_WAKE used to be decidedly too expensive to consider.
> > Maybe that has changed, but I doubt it.
> 
> Right, I through I remembered some such, you could see it on wakeup
> heavy things like pipe-bench and that java msg passing thing, right?

Yeah, it beat up switch heavy buddies pretty bad.

-Mike


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