AW: [Xen-users] cpu frequency scaling in xen 3.3.1

["Carsten Schiers" <carsten@xxxxxxxxxx>]

Florian,

handling of P-States for AMD CPUs is only possible in xen hypervisor 
from CPU Fam 10h on.
The 5050e is family 0Fh.

The alternative is using frequency handling in dom0, by specifying 
cpufreq=dom0-kernel in 
the hypervisor start line. You need powernow-k8.ko then in dom0 and can 
use e.g. the dom0
ondemand governor (by calling cpufreq-set -g ondemand).

Assuming you are German, please see 
http://www.ctserver.org/ftopic2437.html for some details.
It is a bit tricky and still not working 100% without log warnings for 
me and my 4050e.

BR,
Carsten.

-----Ursprüngliche Nachricht-----
Von: Florian Gleixner [mailto:flo@xxxxxxxxx] 
Gesendet: Sonntag, 29. März 2009 12:03
An: xen-users@xxxxxxxxxxxxxxxxxxx
Betreff: [Xen-users] cpu frequency scaling in xen 3.3.1

Hi,

i read the xenpm wiki page, but i cannot use the "p-states". xenpm 
shows:

xenpm
cpu id               : 0
total C-states       : 2
idle time(ms)        : 1776034
C0                   : transition [00000000000000000000]
                       residency  [00000000000000000000 ms]
C1                   : transition [00000000000000260278]
                       residency  [00000000000000000000 ms]

cpu id               : 1
total C-states       : 0
idle time(ms)        : 1771123

[CPU0] failed to get P-states statistics information [CPU1] failed to 
get P-states statistics information

/proc/cpuinfo shows:
model name      : AMD Athlon(tm) Dual Core Processor 5050e

without xen i can scale the frequency perfectly. Are p-states for this 
CPU model unsupported? My grub line is:
    kernel /xen.gz cpufreq=xen cpuidle
...

Thanks for the help!

Florian





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