John Martin <> wrote:

> Bill Holler wrote:
>> Hi John,
>> 
>> The "kstat cstate" shows your system is now using C1 and C3.
>> 
>> Your BIOS is *not* enabling C2.  Many BIOS do not enable C2
>> by default due to a bug in another OS.  The BIOS option to
>> enable C2 is often obscurely worded, so you may have to poke
>> around in the BIOS options to find it.  The (Auto, C1, C1E, C3, C6)
>> BIOS setting you mentioned is the "package level C-state" not
>> per-core level C-state. 
>> 
> The only CPU PM options offered in the eVGA X58 SLI SBIOS:
> 
>   Intel Speed Step [Enabled | Disabled]
>   CxE Function [Auto | Disabled | C1 | C1E | C3 | C6]
> 
> I did check "kstat cstate" on a Tecra M10 and it does offer C1,C2,C3.
> 

deeper c-state support on solaris not only needs BIOS exporting C1, C2
and C3, it also needs HPET and invariant TSC in deeper c-state.
M10 is not supposed to support deep c-state because it doesn't have
invariant TSC in deeper c-state. But your Nehalem i7 920 does.

Thanks,
-Aubrey

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