[coreboot] CPU Turbo [KGPE-D16]

Taiidan at gmx.com Taiidan at gmx.com
Sat Dec 17 02:13:02 CET 2016

y'all helpful as always >:D

On 12/12/2016 03:00 PM, Timothy Pearson wrote:

> Hash: SHA1
> On 12/11/2016 07:52 PM, Taiidan at gmx.com wrote:
>> Thanks! helpful as always >:D
>> Yes c states and cc6 states are enabled, 1 or 2 cores can get up to
>> around 100mhz or so less than turbo 2 however I cannot get the whole
>> advertised 8 or even 4 (i get max around 2.5ghz as reported by "cpupower
>> monitor" ), my temp is 35C with full load cpu usage and my fans nearly
>> off (tower cooler) so I don't think that could be the issue.
> Interesting.  Are these the results of the turbostat program?  What does
> powertop show in the idle stats?
Powertop, around 96-98% or so.
Turbostat doesn't show turbo frequencies for some reason under tsc_mhz,  
and average cpu freq is lower than wcpupower monitor reports.

With a single 100% cpu thread I can get to 3ghz (still a little short), 
however with every thread I add the clock speed goes slightly down.
Weird stuff.

Is there a way to view and force c-states? I tried using 
turionpowercontrol but it didn't work, the cpu simply clocked up again 
and it only has a max cstate and not a min cstate option.
I am curious is there a way to disable the second half of the 16 core 
CPU optys in coreboot?

>> - Do mismatched cpus work at their native clock speeds? What would
>> happen if I inserted for instance a 6220 in to the second cpu socket.
> Yes, they should work at the native clocks.  Don't even try mixing
> different generations of Opteron even with the same socket, it won't
> work, but a minor clock difference shouldn't be a problem in the same
> overall family (e.g. mixing an 82xx with an 82yy should be OK).
I see, thanks!
> - -- 
> Timothy Pearson
> Raptor Engineering
> +1 (415) 727-8645 (direct line)
> +1 (512) 690-0200 (switchboard)
> https://www.raptorengineering.com
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