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

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Message-ID: <BAY128-F371814D6A3033FD7855953BC1A0@phx.gbl>
Date:	Mon, 11 Jun 2007 12:51:30 +0200
From:	"Gerard H. Pille" <ghpille@...mail.com>
To:	hancockr@...w.ca, mikpe@...uu.se
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: system clock slow on Athlon AMD64 since 2.6.21

>From: Robert Hancock <hancockr@...w.ca>
>To: Mikael Pettersson <mikpe@...uu.se>
>CC: ghpille@...mail.com, linux-kernel@...r.kernel.org
>Subject: Re: PROBLEM: system clock slow on Athlon AMD64 since 2.6.21
>Date: Sun, 10 Jun 2007 12:02:00 -0600
>
>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
>To email, remove "nospam" from hancockr@...pamshaw.ca
>Home Page: http://www.roberthancock.com/
>

So I shouldn't have started a new bug report, sorry.  I had once read your  
problem report, but I could not relocate it afterwards.

If I can provide any assistance in debugging, please let me know.

Thanks,

Gerard

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