RE: [Xen-devel] 2.6.31.6 pv_ops with K8 cpufreq

["Langsdorf, Mark" <mark.langsdorf@xxxxxxx>]

> i've an Xen Server running on AMD K8 CPU.
> With Xen-3.4.0 and 2.6.24-24-xen Ubuntu Dom0 Kernel i can use 
> cpufreq via:
> cpufreq=dom0-kernel
> 
> But on 2.6.31.6 pv_ops Kernel i get:
> powernow-k8: Found 1 AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
> processors (2 cpu cores) (version 2.20.00)
> [Firmware Bug]: powernow-k8: No compatible ACPI _PSS objects found.
> [Firmware Bug]: powernow-k8: Try again with latest BIOS.
> 
> I've installed latest BIOS.
> I've read that cpufreq=xen only work with K10.
> Is it so?

cpufreq=xen only works with Family 10h and later processors,
but that's not the problem you're having.

Your problem is that the pv_ops kernel is not finding the
_PSS objects that the 2.6.24 kernel is finding.

A lot of people are reporting this problem recently.  There
appears to be a code change in recent Linux kernels that
causes some BIOSes to stop providing the _PSS objects to
the Linux kernel.  I'm not sure if this is a broken BIOS
issue or a broken Linux issue but I am investigating it.

-Mark Langsdorf
Operating System Research Center
AMD

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