Re: PROBLEM: system clock slow on Athlon AMD64 since 2.6.21
From: Robert Hancock
Date: Sun Jun 10 2007 - 14:02:49 EST
Mikael Pettersson wrote:
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.
Which, if true, is extremely bizarre, as the whole point and reason for
existence of the ACPI PM timer is that it NOT do this, and remain at the
same rate regardless of CPU power management changes..
Robert Hancock Saskatoon, SK, Canada
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