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

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Date:	Tue, 4 Mar 2008 00:10:33 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Pierre Ossman <drzeus-list@...eus.cx>,
	LKML <linux-kernel@...r.kernel.org>,
	Adam Belay <abelay@...ell.com>,
	Andi Kleen <andi@...stfloor.org>,
	Lee Revell <rlrevell@...-job.com>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors

On Mon, Mar 03, 2008 at 06:05:35PM -0500, Alan Stern wrote:
> On Mon, 3 Mar 2008, Pallipadi, Venkatesh wrote:
> 
> > But, with this patch:
> > - we are penalizing good hardware and making them less power efficient
> > to match the bad ones.
> > - There may also be server systems which first may not have these sort
> > of power fluctuations and even when buggy and have this noise, system
> > may be in some corner of some lab with fans making more noise than the
> > capacitors.
> 
> Can you make it configurable through sysfs?  

It already is, through a writable module_parm() 

> Default to disabled, but 
> allow the user to turn it on if the machine makes too much noise.

99+% of the users wouldn't be able to figure that out.

-Andi
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