AW: [Xen-devel] AMD P-States not recognized for Xen 3.3 and 3.4

[Carsten Schiers <carsten@xxxxxxxxxx>]

> ... but was told that it is intentional that there's no code to handle these.

Hm. And for what reason it does work in dom0-kernel? Because it's done by
powernow-k8.ko and userspace software?


----- Originalnachricht -----
Von: Jan Beulich <jbeulich@xxxxxxxxxx>
Gesendet: Mit, 7.1.2009 11:44
An: Carsten Schiers <carsten@xxxxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Betreff: Re: [Xen-devel] AMD P-States not recognized for Xen 3.3 and  3.4

>>> Carsten Schiers <carsten@xxxxxxxxxx> 07.01.09 10:35 >>>
>Xen doesn't seem to fully recognize P-States in my AMD 4050e / Gigabyte M56S-S3
>setting.
>
>What works is a Xen 3.2-1 Debian with waldi 2.6.18-3.1-2 kernel in a way, that 
>when specifying cpufreq=dom0-kernel and using cpufreq-set, I can change CPU
>frequency (minor problem here: it will report backwards running clocks as 
>mentioned
>elsewere here: Timer ISR/0: Time went backwards).
>
>But using cpufreq=xen will not report any P-states at all. Tried with different
>3.3 versions up to 3.3.1 and 3.4 unstable. With cpuidle and without, also did
>an update to BIOS F4 (latest version). Used xenpm from 3.3 and 3.4 to check.
>
>I attached two dmesg / xm dmesg outputs, V1 will show with cpuidle on F4e BIOS,
>V2 will show without cpuidle on F4 BIOS. Both used latest Xen 3.4-unstable and
>waldi 2.6.18-3.3-1 kernel.
>
>Any ideas how to proceed?

This is a pre-Fam10 CPU you use - I wondered about the lack of support
for P-states there as well a while ago, but was told that it is intentional
that there's no code to handle these.

Jan




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