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

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Date:	Thu, 13 Mar 2008 18:44:12 +0100
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	"Len Brown" <lenb@...nel.org>, linux-pm@...ts.linux-foundation.org,
	"Pavel Machek" <pavel@....cz>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Adam Belay" <abelay@...ell.com>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Lee Revell" <rlrevell@...-job.com>
Subject: Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors

On Thu, 13 Mar 2008 09:47:30 -0700
"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com> wrote:

> 
> Can you try using /dev/cpu_dma_latency from an user space application.
> Refer Documentation/pm_qos_interface.txt for usage. With this interface
> you can change menu governor behavior from userspace, by dynamically
> allowing it to use C3 or not. I am thinking that something like allowing
> C3 for few seconds and blocking it for few seconds may help.
> 

I don't quite follow. Is the theory that you get a window of a few seconds where the system stops making a noise, even as it toggles C3?

Rgds
-- 
     -- 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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