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References: <7997200675c1a53b1954fdc3f46dd208db5dea77.1292578808.git.harald.gustafsson@ericsson.com>
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Date: Fri, 17 Dec 2010 16:36:47 +0100
Message-ID: <AANLkTi=Etj3eu25cBuESoXdo3pMnJymFcicW9YN3LMn7@mail.gmail.com>
Subject: Re: [PATCH 1/3] Added runqueue clock normalized with cpufreq
From: Harald Gustafsson <hgu1972@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Harald Gustafsson <harald.gustafsson@ericsson.com>,
        Dario Faggioli <faggioli@gandalf.sssup.it>,
        linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
        Thomas Gleixner <tglx@linutronix.de>,
        Claudio Scordino <claudio@evidence.eu.com>,
        Michael Trimarchi <trimarchi@retis.sssup.it>,
        Fabio Checconi <fabio@gandalf.sssup.it>,
        Tommaso Cucinotta <cucinotta@sssup.it>,
        Juri Lelli <juri.lelli@gmail.com>, Dario Faggioli <raistlin@linux.it>
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2010/12/17 Peter Zijlstra <peterz@infradead.org>:
> I was more hinting at the fact that CPUfreq is at best a controversial
> approach to power savings. I much prefer the whole race-to-idle
> approach, its much simpler.

That depends to a large degree on architecture, chip technology node
and deployed user space
applications. I don't agree that race-to-idle is a good idea for
some/many combinations at least
for embedded systems. But of course race-to-idle is simpler, but not
necessarily giving the
lowest energy.

/Harald
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