The kernel in use: 3.2.0-23-generic on Ubuntu 12.04LTS
For example, I issue the following command:
sudo cpufreq-set -c 0 -g performance
Then I go to
/sys/devices/system/cpu/cpu0/cpufreq and type in the following:
sudo cat cpuinfo_cur_freq
Sometimes I get the max frequency (3600 MHz) when I do this and sometimes I get the min frequency (1600 MHz).
If I do:
The output is
performance, showing that the governor is in fact set to performance.
Then, to make it even more weird, if I do:
analyzing CPU 0: driver: acpi-cpufreq CPUs which run at the same hardware frequency: 0 1 2 3 8 9 10 11 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 10.0 us. hardware limits: 1.60 GHz - 3.60 GHz available frequency steps: 3.60 GHz, 3.60 GHz, 3.47 GHz, 3.33 GHz, 3.20 GHz, 3.07 GHz, 2.93 GHz, 2.80 GHz, 2.67 GHz, 2.53 GHz, 2.40 GHz, 2.27 GHz, 2.13 GHz, 2.00 GHz, 1.87 GHz, 1.73 GHz, 1.60 GHz available cpufreq governors: conservative, ondemand, userspace, powersave, performance current policy: frequency should be within 3.60 GHz and 3.60 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 3.60 GHz. ...
If you look at the current policy above, you will notice that it is telling me that the CPU should be pegged at 3.60 GHz. Yet,
cpuinfo_cur_freq seems to tell a different story.