linux-kernel - Re: [PATCH 0/6] cpufreq: Add sampling window to enhance ondemand governor power efficiency

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Message-ID: <20101223144220.GB1402@srcf.ucam.org>
Date:	Thu, 23 Dec 2010 14:42:20 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	Youquan Song <youquan.song@...el.com>
Cc:	davej@...hat.com, cpufreq@...r.kernel.org, venki@...gle.com,
	arjan@...ux.intel.com, lenb@...nel.org, suresh.b.siddha@...el.com,
	kent.liu@...el.com, chaohong.guo@...el.com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [PATCH 0/6] cpufreq: Add sampling window to enhance ondemand
	governor power efficiency

We've generally been assuming (rightly or wrongly) that getting into 
deep C states is preferable to being active (even at a lower frequency), 
and so the current behaviour of tending to rapidly switch to the maximum 
P state isn't inherently a problem. What kind of power savings are you 
benchmarking with this, and do you still see a saving if you just 
disable turbo mode?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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