$ sudo service cpufrequtils restart

$ cpufreq-info -o
          minimum CPU frequency  -  maximum CPU frequency  -  governor
CPU  0       100000 kHz (  6 %)  -    1536000 kHz (100 %)  -  performance
CPU  1       100000 kHz (  6 %)  -    1536000 kHz (100 %)  -  performance
CPU  2       100000 kHz (  6 %)  -    1536000 kHz (100 %)  -  performance
CPU  3       100000 kHz (  6 %)  -    1536000 kHz (100 %)  -  performance