ubuntu优化cpu的工作频率

sudo     apt-get    install    cpufrequtils

然后sudo      chmod    u+s    /usr/bin/cpufreq-set

在系统启动程序startup application里面添加两条命令：

/usr/bin/cpufreq-set   -c   0   -g   conservative

/usr/bin/cpufreq-set   -c   1   -g   conservative

可以在启动后执行如下命令确认是否生效：

cat    /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

执行cpufreq-info 得到如下信息（电脑是双核的）

nalyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us.
  hardware limits: 1000 MHz - 2.00 GHz
  available frequency steps: 2.00 GHz, 1.67 GHz, 1.33 GHz, 1000 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 1000 MHz and 2.00 GHz.
                  The governor "conservative" may decide which speed to use
                  within this range.
  current CPU frequency is 1000 MHz.
  cpufreq stats: 2.00 GHz:8.28%, 1.67 GHz:1.46%, 1.33 GHz:2.61%, 1000 MHz:87.64%  (35285)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 10.0 us.
  hardware limits: 1000 MHz - 2.00 GHz
  available frequency steps: 2.00 GHz, 1.67 GHz, 1.33 GHz, 1000 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 1000 MHz and 2.00 GHz.
                  The governor "conservative" may decide which speed to use
                  within this range.
  current CPU frequency is 1000 MHz.
  cpufreq stats: 2.00 GHz:8.88%, 1.67 GHz:0.99%, 1.33 GHz:1.57%, 1000 MHz:88.56%  (35873)