AW: Re: AW: [Xen-users] freq scalling

["Carsten Schiers" <carsten@xxxxxxxxxx>]

As said, unless you don't own a Fam 10 CPU (Opteron, Phenom X3 and X4), 
it will not work
With cpufreq=xen. For C2D, I don't know.

BR,
Carsten.

-----Ursprüngliche Nachricht-----
Von: Christoph Kaminski [mailto:mangel@xxxxxx] 
Gesendet: Montag, 2. März 2009 21:40
An: Carsten Schiers
Cc: xen-users
Betreff: Re: AW: [Xen-users] freq scalling

Carsten Schiers schrieb:
> 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
> 

hmm thats the dom0 way, dont have tried it... I have done it on my 
notebook with the hypervisor way - added these parameters to the 
hypervisor:

cpufreq=xen cpuidle

as I say, it does work with notebook but not with the desktop pc's. I 
try the dom0 way now.

Greetz






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