CentOS 7 查看 CPU 节能模式 - 详细指南 - 常规

要查看当前 CPU 是否处于节能模式，可以使用以下命令：

使用以下命令查看当前 CPU 的频率和状态：

cpupower frequency-info

如果节能模式已启用，你将看到类似以下输出：

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:  Cannot determine or is not supported.
  hardware limits: 800 MHz - 3.50 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 800 MHz and 3.50 GHz.
                  The governor 'powersave' may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 1.20 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes

注意观察 'current policy' 和 'current CPU frequency' 的输出。

使用以下命令查看 CPU 的性能配置和功耗状态：

cpupower idle-info

如果节能模式已启用，你将看到类似以下输出：

analyzing CPU 0:
  no or unknown cpuidle driver is active on this CPU
  CPUidle driver: acpi_idle
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency:  Cannot determine or is not supported.
  hardware limits: 800 MHz - 3.50 GHz
  available idle states: C1 C1E
  current idle states: C1 C1E
  boost state support:
    Supported: yes
    Active: yes

注意观察 'current idle states' 的输出。

如果上述命令没有输出或者没有显示节能模式的相关信息，那么可能你的 CPU 不支持节能模式或相关驱动程序未正确加载。