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如何从 cpufreq 中删除 CPU 统计信息？

tag-icon • tag-icon 18.04 xubuntu cpu 32-bit cpufreq
如何从 cpufreq 中删除 CPU 统计信息？

有没有办法删除旧统计数据以便重新开始？我在文件中将最大 CPU 速度设置为 950 MHz cpufrequtils。我的问题是，启动时此限制不起作用，在此期间cpufrequtils正在收集数据，如输出所示：cpufreq stats: 1.20 GHz:27,27%。因此，启动后我想将统计数据重置为零。

peter@peter-HP-Compaq-2510p:~$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to [email protected], please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.20 GHz
  available frequency steps: 1.20 GHz, 1.07 GHz, 933 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 950 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 933 MHz.
  cpufreq stats: 1.20 GHz:27,27%, 1.07 GHz:0,48%, 933 MHz:47,91%, 800   MHz:24,34%  (1449)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 10.0 us.
  hardware limits: 800 MHz - 1.20 GHz
  available frequency steps: 1.20 GHz, 1.07 GHz, 933 MHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace,  powersave, performance
  current policy: frequency should be within 800 MHz and 950 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 933 MHz.
  cpufreq stats: 1.20 GHz:30,29%, 1.07 GHz:0,29%, 933 MHz:51,91%, 800  MHz:17,52%  (763)
peter@peter-HP-Compaq-2510p:~$

![在此处输入图片描述

编辑：尝试按照答案中给出的建议，但文件夹中没有重置：

peter@peter-HP-Compaq-2510p:~$ cd /sys/devices/system/cpu/cpu0/cpufreq/stats
peter@peter-HP-Compaq-2510p:/sys/devices/system/cpu/cpu0/cpufreq/stats$ ls -l
total 0
-r--r--r-- 1 root root 4096 apr 28 09:46 time_in_state
-r--r--r-- 1 root root 4096 apr 28 09:46 total_trans
-r--r--r-- 1 root root 4096 apr 28 09:46 trans_table
peter@peter-HP-Compaq-2510p:/sys/devices/system/cpu/cpu0/cpufreq/stats$ dir
time_in_state  total_trans  trans_table
peter@peter-HP-Compaq-2510p:/sys/devices/system/cpu/cpu0/cpufreq/stats$

答案1

从：Linux(TM) 内核中的 CPU 频率和电压调整统计数据

<mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # ls -l
total 0
drwxr-xr-x  2 root root    0 May 14 16:06 .
drwxr-xr-x  3 root root    0 May 14 15:58 ..
--w-------  1 root root 4096 May 14 16:06 reset
-r--r--r--  1 root root 4096 May 14 16:06 time_in_state
-r--r--r--  1 root root 4096 May 14 16:06 total_trans
-r--r--r--  1 root root 4096 May 14 16:06 trans_table

重置

只写属性，可用于重置统计计数器。这对于评估不同调节器下的系统行为非常有用，无需重新启动。

这将重置所有统计数据：

echo '1' | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/stats/reset

从：如何使用 cpufrequtils

cpu频率设置

允许设置

-d  minimum frequency,
-u  maximum frequency,
-f  specific frequency (userspace governor must be set first) and
-g  governor on a
-c  specific CPU.

cpufreq-set需要 root 权限才能工作。

在你的设置中寻找这个：

sudo cpufreq-set -u 950MGhz

并将其删除。或者将其添加到您的设置中：

sudo cpufreq-set -u 1.20Ghz

从：如何调整 CPU 频率

/etc/default/cpufrequtils 中的 GOVERNOR 变量未生效

因此，您在 /etc/default/cpufrequtils 中配置了 GOVERNOR 变量，并且在重启后通过运行 cpufreq-info 您注意到活动调控器仍然处于“按需”状态。

如果您安装了 laptop-mode-tools，则可能会发生这种情况。laptop-mode 通过以下变量配置活动调节器：BATT_CPU_GOVERNOR、LM_AC_CPU_GOVERNOR、NOLM_AC_CPU_GOVERNOR。您可以在 /etc/laptop-mode/laptop-mode.conf 中根据自己的喜好覆盖它们：

BATT_CPU_GOVERNOR=powersave
LM_AC_CPU_GOVERNOR=conservative
NOLM_AC_CPU_GOVERNOR=ondemand

从：Arch Linux CPU 频率缩放

设置最大和最小频率

在极少数情况下，可能需要手动设置最大和最小频率。

设置最大时钟频率（clock_freq 是时钟频率，单位为：GHz、MHz）：

sudo cpupower frequency-set -u clock_freq

要设置最小时钟频率：

sudo cpupower frequency-set -d clock_freq

要设置 CPU 以指定频率运行：

sudo cpupower frequency-set -f clock_freq

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