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

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Message-ID: <20120110194407.GB28488@elte.hu>
Date:	Tue, 10 Jan 2012 20:44:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Youquan Song <youquan.song@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
	akpm@...ux-foundation.org, stable@...r.kernel.org,
	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


* Ingo Molnar <mingo@...e.hu> wrote:

> > a very good default would be to keep all tasks on one 
> > package until half the cores in the package are busy, and 
> > then start spreading out.
> > 
> > I suspect that'll be the 90% case coverage.
> 
> Maybe - but there's no reason to connect all the dots within 
                                  ^not
> the kernel and actually *discover* and use the very, very 
> likely performance preference of the hardware in question.

Thanks,

	Ingo
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