linux-kernel - Re: PROBLEM: system clock slow on Athlon AMD64 since 2.6.21

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Message-Id: <200706091453.l59ErWtB026333@harpo.it.uu.se>
Date:	Sat, 9 Jun 2007 16:53:32 +0200 (MEST)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	ghpille@...mail.com, linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: system clock slow on Athlon AMD64 since 2.6.21

On Fri, 08 Jun 2007 10:14:03 +0200, Gerard H. Pille wrote:
> [1.] One line summary of the problem:
> Since I switched from 2.6.20 to 2.6.21 on my Athlon AMD64 laptop, the system 
> time is slow - about 1' on 15'.

According to your system description it seems that you have a
Targa Visionary laptop with a VIA chipset and a Mobile Athlon64.
If so, then you probably have the same problem I reported some time
ago: see <http://marc.info/?l=linux-kernel&m=117681226421346&w=2>
and the followup messages. The conclusion was that the chipset's
ACPI PM timer slows down when the CPU is in C2.

The workaround is to boot with processor.max_cstate=1.

/Mikael
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