Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors

[Pierre Ossman]

On Tue, 11 Mar 2008 16:20:26 +0100
Pierre Ossman <drzeus-list@xxxxxxxxx> wrote:

> On Tue, 11 Mar 2008 11:48:22 +0100
> Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> 
> > > I have now found a very hacky workaround that is slightly better than
> > > disabling C3 altogether; making C3 exclusive to one core at a time. It
> > > seems to kill the noise and the system now spends 50% in C3, instead of
> > > 0%.
> > 
> > I suspect it won't do much of C3 if only one core is idle this way.
> > Most likely you just disabled C3 this way in a way invisible to software.
> > 
> 
> What a letdown... I'll pull out the old watt meter again and see if I can confirm that.
> 

It seems that you are correct Andi. Power usage is in line with C3 completely disabled. Bummer :/

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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