Re: PROBLEM: system clock slow on Athlon AMD64 since 2.6.21

["Gerard H. Pille" <ghpille@hotmail.com>]

> From: Robert Hancock <hancockr@shaw.ca>
> To: Mikael Pettersson <mikpe@it.uu.se>
> CC: ghpille@hotmail.com, linux-kernel@vger.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@nospamshaw.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

_________________________________________________________________
Looking for an old friend? You may find him in  your friends' friends list ! 
http://spaces.live.com/default.aspx?page=Ed01&ss=True

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/