Ralf Schenk
2006-Apr-07 22:44 UTC
[Xen-users] XEN and Frequency scaling PowerNow or Speedstep
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@databay.de Databay AG Hüttenstraße 7 D-52068 Aachen www.databay.de Databay - einfach machen. _________________________________________________ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Stuart Jansen
2006-Apr-08 00:24 UTC
Re: [Xen-users] XEN and Frequency scaling PowerNow or Speedstep
On Sat, 2006-04-08 at 00:44 +0200, Ralf Schenk wrote:> 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.I''m pretty new to Xen myself, but it looks like a patch was recently submitted to add powernow-k8 support: http://article.gmane.org/gmane.comp.emulators.xen.devel/22282 No idea if it was accepted and made it in to 3.0.2. -- Stuart Jansen <sjansen@gurulabs.com> Guru Labs, L.C. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Ralf Schenk
2006-Apr-08 00:43 UTC
Re: [Xen-users] XEN and Frequency scaling PowerNow or Speedstep
Stuart Jansen schrieb:> On Sat, 2006-04-08 at 00:44 +0200, Ralf Schenk wrote: >> 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. > > I''m pretty new to Xen myself, but it looks like a patch was recently > submitted to add powernow-k8 support: > > http://article.gmane.org/gmane.comp.emulators.xen.devel/22282 > > No idea if it was accepted and made it in to 3.0.2. >Hello ! I tried it instantly - It works for me ! I''ll see if my system stays stable in the next days. Thanks a lot. For people using mobile cpus this would be also an interesting example for implementing this into other kernelmodules (i.e. speedstep) to ake them work with XEN. -- __________________________________________________ Ralf Schenk fon (02 41) 9 91 21-0 fax (02 41) 9 91 21-59 rs@databay.de Databay AG Hüttenstraße 7 D-52068 Aachen www.databay.de Databay - einfach machen. _________________________________________________ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users