I am trying to set to a specific frequency in cpu governor. However, I am not being able to do so. My processor is 12*Intel(R) Xeon (R) CPU E5-2620 v3 @2.40 GHz
With intel_pstate driver it gives freq range of 1.20 GHz -3.20 GHz. The current freq scaling, I can not set to a specific freq. I set the governor to performance. But it does not help. cpufreq-set -r -f 3.2GHz –does not work;
I tried to set the lower freq; cpufreq-set -r -d 3.2GHz; does not show any error, but even then the freq keeps on varying with time.
I disabled intel_pstate (on boot) and activated acpi driver. But with acpi, the max I can get is 2.4 GHz at 12 cores. This 2.4 GHz, I can make stable all the time with cpufreq-set -r -f. But I can not set it to 3.2 GHz.
Could anyone please tell me how to set use the cpugovernor, so I can set frequency to 3.2 GHz? My OS is ubuntu 14.4.3 LTS and kernel version is 3.19.0-25-generic.
The cpufreq-info shows the following result.
analyzing CPU 0: driver: intel_pstate CPUs which run at the same hardware frequency: 0 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 0.97 ms. hardware limits: 1.20 GHz - 3.20 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 3.20 GHz and 3.20 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 2.85 GHz.
For other cores also, the results are like this and current freq varies with time.