====== Linux 內設定 CPU 頻率的方式 ======
  * 安裝環境 Debian 12.1

===== 安裝方式 =====
  * <cli>apt install cpufrequtils</cli>

===== 使用方式 =====
  * 查詢目前 CPU 個核心執行頻率 cpufreq-info ++看結果|<cli>
# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, 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: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.70 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: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.70 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: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.70 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: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.40 GHz.
analyzing CPU 4:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 4
  CPUs which need to have their frequency coordinated by software: 4
  maximum transition latency: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.40 GHz.
analyzing CPU 5:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 5
  CPUs which need to have their frequency coordinated by software: 5
  maximum transition latency: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 1.34 GHz.
analyzing CPU 6:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 6
  CPUs which need to have their frequency coordinated by software: 6
  maximum transition latency: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.70 GHz.
analyzing CPU 7:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 7
  CPUs which need to have their frequency coordinated by software: 7
  maximum transition latency: 4294.55 ms.
  hardware limits: 400 MHz - 4.50 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 4.50 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.70 GHz.
</cli>++

  * 設定 CPU 運行模式 powersave(省電模式), userspace(使用者自訂), ondemand(自動調整), conservative(保守模式), performance(高效能模式)  Exp. 設定為 powersave<cli>
echo "GOVERNOR=\"powersave\"" > /etc/default/cpufrequtils
systemctl restart cpufrequtils
</cli>

===== 參考網址 =====
  * https://sunpma.com/115.html

{{tag>linux cpu}}