Update: Linux

Author: wdv4758h

operating-system/cases/linux/distros/archlinux/cpu-frequency.rst

@@ -0,0 +1,61 @@
+========================================
+CPU Frequency
+========================================
+
+
+.. contents:: 目錄
+
+
+CPU frequency driver
+========================================
+
+.. code-block:: sh
+
+    ls /usr/lib/modules/$(uname -r)/kernel/drivers/cpufreq/
+
+
+Intel CPU 可能會使用 P-state driver，
+但是可以透過以下更動來關閉，
+藉此切換到 acpi-cpufreq driver：
+
+``/etc/default/grub``:
+
+.. code-block:: conf
+
+    GRUB_CMDLINE_LINUX_DEFAULT="... intel_pstate=disable"
+
+
+使用 acpi-cpufreq driver 後，
+Linux 5.10 以上會讓 schedutil 來控制速度。
+
+
+看現在的機制：
+
+.. code-block:: sh
+
+    cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
+
+
+
+工具 - cpupower
+========================================
+
+.. code-block:: sh
+
+    sudo pacman -S cpupower
+
+    # 看現在狀態
+    cpupower frequency-info
+    # 設定上限
+    sudo cpupower frequency-set -u 3900000
+    # 設定下限
+    sudo cpupower frequency-set -d 3900000
+    # 設定速度
+    sudo cpupower frequency-set -f 3900000
+
+
+
+參考
+========================================
+
+* `Arch Wiki - CPU frequency scaling <https://wiki.archlinux.org/index.php/CPU_frequency_scaling>`_