ubuntu如何把调整cpu策略

一、安装cpu频率管理软件

sudo apt-get install cpufrequtils

二、查看cpu当前状态

cpufreq-info

feng@Heimerdinger:/sys/devices/system/cpu/cpu2/cpufreq$ cpufreq-info 
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to [email protected], please.
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: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz.
analyzing CPU 1:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 0.97 ms.
  hardware limits: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz.
analyzing CPU 2:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 2
  CPUs which need to have their frequency coordinated by software: 2
  maximum transition latency: 0.97 ms.
  hardware limits: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz.
analyzing CPU 3:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 3
  CPUs which need to have their frequency coordinated by software: 3
  maximum transition latency: 0.97 ms.
  hardware limits: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz.

其中available cpufreq governors：performance，powersave表示我的cpu目前只支持高性能和省电两个模式

所有的策略模式包括powersave, userspace, ondemand, conservative, performance这几种

三、设置cpu策略（在此我设置的策略是performance）

sudo cpufreq-set -g performance

此刻cpu的频率就有所改变了，在查看cpu信息

feng@Heimerdinger:/sys/devices/system/cpu/cpu2/cpufreq$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to [email protected], please.
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: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 2.20 GHz.
analyzing CPU 1:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 0.97 ms.
  hardware limits: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.20 GHz.
analyzing CPU 2:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 2
  CPUs which need to have their frequency coordinated by software: 2
  maximum transition latency: 0.97 ms.
  hardware limits: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.20 GHz.
analyzing CPU 3:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 3
  CPUs which need to have their frequency coordinated by software: 3
  maximum transition latency: 0.97 ms.
  hardware limits: 500 MHz - 2.70 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 500 MHz and 2.70 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.20 GHz.

四、设置当下策略下cpu频率

sudo cpufreq-set -d 1800m -u 2700m      //适用模式：powersave|ondemand|conservative|performance

sudo cpufreq-set -f {1800m~2700m}       //适用模式：userspace

 -d 设置最小频率

 -u 设置最大频率