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RE: [Xen-devel] Cpufreq on k8 with xen dom0

To: geaaru@xxxxxxxxx
Subject: RE: [Xen-devel] Cpufreq on k8 with xen dom0
From: "Langsdorf, Mark" <mark.langsdorf@xxxxxxx>
Date: Fri, 28 Sep 2007 07:44:00 -0500
Cc: Xen-Devel ML <xen-devel@xxxxxxxxxxxxxxxxxxx>, Goswin von Brederlow <brederlo@xxxxxxxxxxxxxxxxxxxxxxxxxxx>, Bhavana Nagendra <bnagendr@xxxxxxxxxx>
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Thread-topic: [Xen-devel] Cpufreq on k8 with xen dom0
> Hi, i try to use xen-unstable.hg version but doesn't work.
> >From dmesg i have this error:
> powernow-k8: Found 1 AMD Turion(tm) 64 Mobile Technology ML-30
> processors (version 2.00.00)
> powernow-k8: BIOS error - no PSB or ACPI _PSS objects
> ACPI: (supports S0 S3 S4 S5)
> While, if i try to call cpufreq-info i have this output:
> cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
> Report errors and bugs to linux@xxxxxxxx, please.
> analyzing CPU 0:
>   no or unknown cpufreq driver is active on this CPU
> any idea how can i resolve this problem?

dom0 isn't seeing the ACPI _PSS objects (I thought the
error message made that clear).  No ACPI objects means
no information on the pstates.

Do you get PowerNow! support on a native version 2.6.21+
kernel?  If not, you need to update your BIOS to something
that supports pstates (or possibly you have one of the
rare Turions that doesn't support more than 1 pstate,
but I doubt that).  

If 2.6.21+ native works, check to see if 2.6.18 native
works.  If it doesn't, then there was a change to the
ACPI interpreter to support your laptop that will need
to be backported.  If 2.6.18 native works, then there's
a difference between the Xen ACPI interpreter and the
native mode interpreter that will need to be ported to

-Mark Langsdorf
Operating System Research Center

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