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xen-users
AW: Re: AW: [Xen-users] cpu frequency scaling in xen 3.3.1
Latest 3.3 Xen docs will explain the parameters, but don't give the
background information. It's
barried deep in the Xen-Devel list. I don't think <Fam10h families will
be ever supported diretctly
in the hypervisor, but there is no necessity to do so. The modified
ondemand governor uses a hypercall
to get idle times and follow the policy.
Building cpufreq management and the necessary drivers (e.g. powernow-k8,
cpufreq_ondemand,...) is a
bit tricky. Follow the link. Eventualy you also need to patcht he
Kconfig file a bit...
BR,
Carsten.
-----Ursprüngliche Nachricht-----
Von: Florian Gleixner [mailto:flo@xxxxxxxxx]
Gesendet: Sonntag, 29. März 2009 18:19
An: Carsten Schiers
Cc: xen-users
Betreff: Re: AW: [Xen-users] cpu frequency scaling in xen 3.3.1
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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