2.6.31.6 pv_ops with K8 cpufreq

2.6.31.6 pv_ops with K8 cpufreq

[Stefan Kuhne]

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Hello,

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?

On Intel CPU this Kernel make cpufreq fine with xen-4.0.0-rc1.

Regards,
Stefan Kuhne


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RE: 2.6.31.6 pv_ops with K8 cpufreq

[Langsdorf, Mark]

> 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

Re: 2.6.31.6 pv_ops with K8 cpufreq

[Stefan Kuhne]

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Am 08.02.2010 15:32, schrieb Langsdorf, Mark:
>> 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.
> 
Will it changed, or does i need an K10 CPU?

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

> 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.
> 
I've tried an Vanilla 2.6.32.7 and cpufreq works fine.
So, it is in 2.6.31 or in Xen Kernel.

If you need more informations (CPU, Board ...), i'll try to help you.

Regards,
Stefan Kuhne


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Re: 2.6.31.6 pv_ops with K8 cpufreq

[Stefan Kuhne]

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Am 08.02.2010 15:43, schrieb Stefan Kuhne:
> Am 08.02.2010 15:32, schrieb Langsdorf, Mark:

>> cpufreq=xen only works with Family 10h and later processors,
>> but that's not the problem you're having.
>>
> Will it changed, or does i need an K10 CPU?
> 
I'll wait for 870G Chipset and upgrade my Server.

Regards,
Stefan Kuhne


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