Re: SMP C-states on x86_64 Status

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On Sunday 05 November 2006 06:37, Mathew Brown wrote:
> Hi,
>   I just saw Adrian's post on a patch to add SMP C-states on x86_64 to
>   kernel 2.6.16.  Is there anywhere I can find the current status of
>   C-states on SMP machines?  I have a 16-core machine running RHEL with
>   kernel 2.6.9-34 and it shows only C0, nothing else.  I checked the
>   DSDT and it compiled without error.  Any ideas?  Thanks for your help.

This support (bugzilla 5653) shipped starting in 2.6.18, and I sent it to Adrian
for 2.6.16.stable -- and it appears it will pop out in 2.6.16.31.

Re: your 16 core machine running 2.6.9...
What does /proc/acpi/processor/*/power say?
I would expect it to say C1 only.

I would not expect this box to grow deeper C-states upon the support above.
The only SMP boxes with C-states deeper than C1 that I'm aware of today
are laptops.

cheers,
-Len



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