Re: Changing CPU frequency for Xeon processors

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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