Subject: Re: High pitched noise from laptop: processor.c in linux 2.6
From: Lee Revell <rlrevell@joe-job.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Pavel Machek <pavel@ucw.cz>, M <mru@mru.ath.cx>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: Sat, 16 Oct 2004 21:24:43 -0400
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On Sat, 2004-10-16 at 17:46, Alan Cox wrote:
> On Sad, 2004-10-16 at 20:52, Lee Revell wrote:
> > > What benefits? HZ=1000 takes 1W more on my system.
> > Better timer resolution?
> 
> And heavily reduced accuracy on a lot of laptops where 1000Hz
> is enough to make the clock slide every time the battery state is
> queried or an SMM event triggers.
> 

Wouldn't such a laptop be horribly broken?  1ms is a LONG time to
disable interrupts.  That's millions of CPU cycles...

> Getting the best of both worlds depends on the stuff discussed at OLS
> being finished, then you can have 1Khz accurancy and battery life
> 

I was not there but I imagine this involves a way to get 1khz accuracy
with a 100Hz timer interrupt rate?

Lee

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