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Date: Sat, 9 Jul 2005 12:12:12 -0700
From: Andrew Morton <akpm@osdl.org>
To: Lee Revell <rlrevell@joe-job.com>
Cc: arjan@infradead.org, azarah@nosferatu.za.org, cw@f00f.org,
       linux-kernel@vger.kernel.org, torvalds@osdl.org, christoph@lameter.org
Subject: Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
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Lee Revell <rlrevell@joe-job.com> wrote:
>
>  > This is not a userspace visible thing really with few exceptions, and
>  > well people can select the one they want, right?
> 
>  Then why not leave the default at 1000?

Because some machines exhibit appreciable latency in entering low power
state via ACPI, and 1000Hz reduces their battery life.  By about half,
iirc.