Thanks a lot for your input Len. For my 16 core machine, cat
/proc/acpi/processor/*/power gives the following:
active state: C1
default state: C1
bus master activity: 00000000
states:
*C1: promotion[--] demotion[--] latency[000] usage[0000000000]
C2: <not supported>
C3: <not supported>
So I gather that this means that even with CPU frequency scaling, I'm
really not doing anything since the voltage and power going to the CPU
are going to be constant until I upgrade to 2.6.18. Am I correct?
Len Brown wrote:
> 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
>
>
>
--
Mathew Brown
mathewbrown@xxxxxxxxxxx
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