Changing CPU frequency for Xeon processors

[Michio Honda]

Thanks Eric, in case of HP Proliant DL120 G7 server, BIOS's configuration needs to be "OS Control Mode".
The similar would apply to other systems.

Cheers,
- Michio

On May 18, 2013, at 10:07 PM, Eric van Gyzen wrote:

> On 05/18/2013 10:09 AM, Michio Honda wrote:
>> Hi,
>> 
>> I'm trying to experiment with downclocking CPU.
>> My environment is 10.0-CURRENT amd64.
>> 
>> However, my CPU (Xeon E31220) seems not to be supported by the cpufreq module, thus dmesg shows:
>> est0: <Enhanced SpeedStep Frequency Control> on cpu0
>> est: CPU supports Enhanced Speedstep, but is not recognized.
>> 
>> As a result, although sysctl -a shows the list of available frequency values (dev.cpu.0.freq_levels: 3093/-1 2706/-1 2319/-1 1933/-1 1546/-1 1159/-1 773/-1 386/-1
>> dev.), I cannot set the value (the error message is "sysctl: dev.cpu.0.freq=773: Device not configured").
>> 
>> Do you have any idea to change CPU frequency for this CPU?
> 
> In my experience, the "not recognized" message indicates that the feature is not enabled in the BIOS.
> 
> Eric
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