RE: powernow-k8: out of sync on Athlon64 x2 3800+

[Niklas Edmundsson <Niklas.Edmundsson@hpc2n.umu.se>]

On Wed, 1 Feb 2006, shin, jacob wrote:

> Hello,
>
> I don't think this is a BIOS issue, but a kernel bug in the i386 
> tree.  I believe this was recently discussed and hopefully fixed by 
> Andi Kleen in the kernel mailing list:
>
> http://lkml.org/lkml/2006/1/9/442

My symptoms are identical, so it's probably that bug. I guess my bug 
report through FSC's official support channel will bounce eventually 
then ;)

> This is a critical bug especially for systems running AMD Dual-Core 
> Processors on i386 kernel configuration w/ powernow-k8.
>
> The reason for "powernow-k8 - out of sync" errors is because the 
> cpufreq driver is not aware [or has the wrong idea] about which CPUs 
> are tied together, because cpu_core_id and phy_proc_id data is 
> wrong.
>
> Now this is fairly harmless as Mark mentioned, but only on single 
> socket Dual Core systems.

It doesn't crash my machine, but it also doesn't seem capable to 
really lower the clock frequency...

> I was wondering if anyone has already tested Andi's patch, if it 
> successfully solves this problem, and if the patch has made it into 
> the git yet.

I can give the patch a try if you feel that would help, albeit I 
prefer not rebooting my workstation ;)

/Nikke
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 Niklas Edmundsson, Admin @ {acc,hpc2n}.umu.se     |    nikke@hpc2n.umu.se
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