Question

我想改变cpu频率。我已经安装了cpufrequtils。命令＆＃34; cpufreq-info＆＃34;给我信息

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: 0.97 ms.
  hardware limits: 1.20 GHz - 2.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 1.20 GHz and 2.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.

当我尝试运行命令时：＆＃34; sudo cpufreq-set -f 1500000＆＃34;。我收到了错误：

Error setting new values. Common errors:
- Do you have proper administration rights? (super-user?)
- Is the governor you requested available and modprobed?
- Trying to set an invalid policy?
- Trying to set a specific frequency, but userspace governor is not available,
   for example because of hardware which cannot be set to a specific frequency
   or because the userspace governor isn't loaded?

你能说出如何处理这个问题吗？

Answer 1

直接回答

在grub配置文件中禁用intel_pstate：
```
$ sudo vi /etc/default/grub
```
追加＆＃34; intel_pstate =禁用＆＃34;到GRUB_CMDLINE_LINUX =选项

刷新grub引导配置文件：

对于Ubuntu：

$ sudo update-grub

对于Fedora：

$ sudo grub2-mkconfig -o /boot/grub2/grub.cfg

重新启动。
```
$ sudo reboot
```

将CPU电源调控器设置为用户空间：

$ sudo cpupower frequency-set --governor userspace

设置CPU频率：

$ sudo cpupower --cpu all frequency-set --freq 1.5GHz

验证
```
$ cpupower frequency-info
```
您应该看到以下行：＆＃34;当前CPU频率为1.50 GHz。＆＃34;

详细答案

您无法设置CPU频率的原因是因为您使用的驱动程序是＆＃34; intel_pstate＆＃34;，这是现在的默认驱动程序，仅提供＆＃34;性能＆＃34;和＃34;节电＆＃34;政策。它们都不支持直接从用户空间操纵CPU频率。此外，最近的英特尔CPU实现了硬件P状态，这是一个硬件模块，可以卸载监视CPU使用情况并直接在CPU芯片中调节P状态。

因此，为了根据需要控制频率，可以选择禁用＆＃34; intel_pstate＆＃34;司机和使用旧的＆＃34; acpi-cpufreq ＆＃34;驱动程序，具有＆＃34; 用户空间＆＃34;允许来自用户空间的CPU频率控制的策略。

自最近的Linux内核构建＆＃34; intel_pstate＆＃34;直接进入内核而不是作为一个模块，没有简单的方法去＆＃34; rmmod＆＃34;它。所以你必须提供内核cmdline参数＆＃34; intel_pstate = disable＆＃34;这样做。

更多信息

https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt https://www.kernel.org/doc/Documentation/cpu-freq/intel-pstate.txt

Answer 2

尝试sudo cpufreq-set -g performance

如何解决cpufreqset错误

2 个答案: