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

[Florian Gleixner <flo@xxxxxxxxx>]

Thanks!

Is there a document that i have overseen? Or is the documentation missing?
Cpu frequency scaling inside the hypervisor would be great. Where can i
vote for that my CPU model will be included?
I'll try to get the powernow-k8.ko build now. Opensuse 11.1 has it for
the non-xen kernel but did not include it in the xen enabled kernel.

Florian

Carsten Schiers wrote:
> 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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