Ubuntu 下cpu的设置

安装cpufrequtils：

yu@ubuntu:~$ sudo apt-get install cpufrequtils 

查看cpu的信息：

yu@ubuntu:~$ sudo cpufreq-info
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 4294.55 ms.
  hardware limits: 800 MHz - 1.90 GHz
  available frequency steps: 1.90 GHz, 1.80 GHz, 1.60 GHz, 1.40 GHz, 1.20 GHz, 1000 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 1.90 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 1.90 GHz:-nan%, 1.80 GHz:-nan%, 1.60 GHz:-nan%, 1.40 GHz:-nan%, 1.20 GHz:-nan%, 1000 MHz:-nan%, 800 MHz:-nan%  (12092)
　 analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 4294.55 ms.
  hardware limits: 800 MHz - 1.90 GHz
  available frequency steps: 1.90 GHz, 1.80 GHz, 1.60 GHz, 1.40 GHz, 1.20 GHz, 1000 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 1.90 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 8http://i.cnblogs.com/EditPosts.aspx?opt=100 MHz (asserted by call to hardware).
  cpufreq stats: 1.90 GHz:-nan%, 1.80 GHz:-nan%, 1.60 GHz:-nan%, 1.40 GHz:-nan%, 1.20 GHz:-nan%, 1000 MHz:-nan%, 800 MHz:-nan%  (13263)

从上面可以看到本机cpu的频率限制在800M～1.9GHZ之间。

可选设置频率有1.90GHz  1.80GHz 1.60GHz   1.40GHz  1.20GHz  1000MHz   800MHz

cpu对用的模式有5种：conservative, ondemand, userspace, powersave,performance                       

分别对应   自适应调节模式 自调节模式  用户（有root权限）自定义模式省电模式     最高或者最低频率

可参考：https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt

设置cpu模式：sudo cpufreq-set -g {conservative | ondemand  | userspace  | powersave  | performance }

设置cpu频率:  sudo cpufreq-set -f {800~1900}(设置你的频率，使用cpufreq-info可以查看你的cpu支持哪些) 

使用 cpufred-set -d 600M (最低) ，cpufreq-set -u 1.5G (最高)