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Date: Wed, 3 Apr 2002 16:17:31 +0200 (SAST)
From: Zwane Mwaikambo <zwane@linux.realnet.co.sz>
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To: Chris Wilson <chris@jakdaw.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: P4/i845 Strange clock drifting
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On Wed, 3 Apr 2002, Chris Wilson wrote:

> I've got a 1U 2.0 Ghz P4 rackmount server with an i845 chipset and have
> noticed some strange issues with the timer. For the most part it keeps
> time perfectly... but pretty often (tens of times each day) it'll have
> drifted anything from a few seconds to a few minutes - during a 10 minute
> period. It's always behind-time - so perhaps this is something to do with
> the P4's throttling stuff? Has anyone else seen similar?

The throttle is not supposed to affect the TSC, and only takes affect 
when overheating.

> I tried to use 2.5.7-dj2 with Zwane Mwaikambo's thermal LVT support in
> there but it didn't detect a local APIC on bootup (!) - I'm guessing there
> needs to be an APIC for Zwane's stuff? When I tried to switch back to

-dj2 P4 thermal patch is a bit broken (my bad), but the fact that it 
doesn't detect an APIC means that code would, erm do interesting things...

	Zwane

-- 
http://function.linuxpower.ca
		

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