[Xen-users] XEN and Frequency scaling PowerNow or Speedstep

[Ralf Schenk <rs@xxxxxxxxxx>]

Hello !

I installed xen-unstable with a custom 2.6.16 kernel on my "server" at
home (Athlon64 3200+ Venice Type, OpenSuse 10.0). Before using XEN my
system was sucessfully scaling CPU Frequency. The CPU supports 3
Frequencies and voltages.

from dmesg when loading module powernow-k8
Apr  8 00:30:02 parzival kernel: powernow-k8:    0 : fid 0xc (2000 MHz),
vid 0x6 (1400 mV)
Apr  8 00:30:02 parzival kernel: powernow-k8:    1 : fid 0xa (1800 MHz),
vid 0x8 (1350 mV)
Apr  8 00:30:02 parzival kernel: powernow-k8:    2 : fid 0x2 (1000 MHz),
vid 0x12 (1100 mV)

This led to a really "cool and quiet" system since the Mainboard (ASUS
A8N-E) is also controlling the CPU-fan depending on temperature. This
system is running 24/7 and is in our living room so the system
components were carefully chosen to be quiet.

Now under XEN this doesn't work anymore. Is this a missing feature or a
bug ? My message log fills up with:

Apr  8 00:30:03 parzival kernel: powernow-k8: fid trans failed, fid 0x2,
curr 0xc
Apr  8 00:30:03 parzival kernel: powernow-k8: transition frequency failed
Apr  8 00:30:05 parzival kernel: powernow-k8: fid trans failed, fid 0x2,
curr 0xc
Apr  8 00:30:05 parzival kernel: powernow-k8: transition frequency failed

Of course my home system is not that important for the XEN roadmap but
even the professional CPU's get powersaving and frequency-scaling
functions like EIST these days to keep crowded server racks cool.

If XEN is made for efficency this is an important feature...

Any hints ?

-- 
__________________________________________________

Ralf Schenk
fon (02 41) 9 91 21-0
fax (02 41) 9 91 21-59
rs@xxxxxxxxxx

Databay AG
Hüttenstraße 7
D-52068 Aachen
www.databay.de

Databay - einfach machen.

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