AW: [Xen-users] freq scalling

["Carsten Schiers" <carsten@xxxxxxxxxx>]

Christoph,

you need to have several prerequisites to enable freq scaling, depending 
on your cpu.
I can describe here what is necessary to do that for AMD CPUs < Fam10h, 
as I have worked
on that issue now for a while.

1) You do that in Xen or dom0-kernel (for this case by setting 
cpufreq=dom0-kernel)
2) In dom0-kernel, you need a kernel module, e.g. powernow-k8.ko 
2a) in order to get this, you need to remove the dependency just at the 
beginning od
    drivers/cpufreq/Kconfig, which disables compilation. For Debian, you 
need to do that
    by modifying the Debian patches in debian/patches. Do a grep -r on 
the path.
3) you need a governor. I recommend ondeman
4) to set the governor, you need cpufreq-utils, as this governor might 
not be the default

BR,
Carsten.

-----Ursprüngliche Nachricht-----
Von: Christoph Kaminski [mailto:mangel@xxxxxx] 
Gesendet: Montag, 2. März 2009 16:54
An: xen-users
Betreff: [Xen-users] freq scalling

Hi!

Freq scalling works here with a notebook (TP R61) and xen 3.3.1 (c2d 
cpu). But with the same xen Version freq scalling doesnt work with 2 
desktop PC's (c2d and amd x2 cpu's).

Are only notebook cpu's supported?

Greetz

PS: sorry for my english

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