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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Missed jiffies
Date: 17 Feb 2002 14:48:18 -0800
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Followup to:  <3C6E833F.1A888B3C@mvista.com>
By author:    george anzinger <george@mvista.com>
In newsgroup: linux.dev.kernel
> 
> One of the nasty problems, especially with machines such as yours (i.e.
> lap tops), is the fact that TSC is NOT clocked at a fixed rate.  It is
> affected by throttling (reduced in 12.5% increments) and by power
> management.

If the TSC is affected by HLT, throttling, or C2 power management, the
TSC is broken (as it is on Cyrix chips, for example.)  The TSC usually
*is* affected by C3 power management, but the OS should be aware of
C3.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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