On Sunday, August 03, 2008 at 8:31 AM, Kai Schaetzl wrote: > > ...I have an older low-voltage AMD CPU (probably about 2 years > on the market) that is recognized as X2 3800+ but frequency > scaling fails because it miscalculates the current speed to > 800 MHz as well. Is there anything I can do about that? Where > could I check whether this CPU should be supported in full and > frequency scaling working? > The cpuspeed changelog may be relevant: [quote] * Thu Mar 06 2008 Jarod Wilson <jwilson at redhat.com> - Disable freq scaling by default on AMD rev F and earlier cpus when running xen, due to clock instability (#435321) [/quote] I didn't look up your cpu, but I think it's a revision F. Also, thanks for the /etc/sysconfig/cpuspeed "ondemand" tip. It seemed counterintuitive to explicitly specify the so-called default governor value (i.e., "empty defaults to ondemand"), but doing so did the trick under xen for my revision G AMD processor. Steve