linux-kernel - Re: [PATCH] x86,sched: Fix sched_smt_power

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Message-ID: <1326160461.2366.19.camel@sbsiddha-mobl2>
Date:	Mon, 09 Jan 2012 17:54:21 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Youquan Song <youquan.song@...el.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, akpm@...ux-foundation.org, stable@...r.kernel.org,
	arjan@...ux.intel.com, len.brown@...el.com, anhua.xu@...el.com,
	chaohong.guo@...el.com, Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [PATCH] x86,sched: Fix sched_smt_power_savings totally broken

On Mon, 2012-01-09 at 15:29 +0100, Vincent Guittot wrote: 
> Hi Peter,
> 
> I'm also using sched_mc level for doing powersaving load balance on
> ARM platform and we have real benefits.

hi Vincent, Can you elaborate on your platform topology where you see
the benefits?

on x86, 'sched_mc' was designed for the case of consolidating load into
one socket before using another idle socket.

Just wondering if this is your use case too or if you are consolidating
at a different topological level.

thanks,
suresh 

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