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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