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Rick T
Asked: 2021-12-04 08:08:30 +0800 CST

添加到 grub 文件时未加载 intel_pstate 驱动程序

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我有一个

Processor   Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
Memory  16305MB (2531MB used)
Machine Type    Laptop
Operating System    Ubuntu 20.04.3 LTS

在我的/etc/default/grub文件中，我有一行

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"

更改后我做了sudo update-grub但是当我做 cpupower frequency-info 或 cpufreq-info --driver它说使用的驱动程序是intel_cpufreq

rt@sys76:~$ cpufreq-info --driver
intel_cpufreq


rt@sys76:~$ cpupower frequency-info

analyzing CPU 0:
  driver: intel_cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 20.0 us
  hardware limits: 800 MHz - 3.40 GHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 1.70 GHz and 3.40 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 798 MHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes
rt@sys76:~$

如何让cpufreq-info --driver 使用intel_pstate驱动程序？

drivers

1 个回答

  1. Best Answer

    您的处理器 i7-4700MQ 早于 HWP（硬件 Pstate）控制。由内核电源管理组确定的迁移路径，对于这些 Intel 处理器，默认为使用 schedutil 缩放调控器处于被动模式的 intel_pstate CPU 频率缩放驱动程序。为此，完成了此提交：

    提交 33aa46f252c703e42c81a76696cd0c240f2281e4 作者：Rafael J. Wysocki [email protected] 日期：2020 年 3 月 25 日星期三 15:03:35 +0100

    cpufreq: intel_pstate: Use passive mode by default without HWP

After recent changes allowing scale-invariant utilization to be
used on x86, the schedutil governor on top of intel_pstate in the
passive mode should be on par with (or better than) the active mode
"powersave" algorithm of intel_pstate on systems in which
hardware-managed P-states (HWP) are not used, so it should not be
necessary to use the internal scaling algorithm in those cases.

Accordingly, modify intel_pstate to start in the passive mode by
default if the processor at hand does not support HWP of if the driver
is requested to avoid using HWP through the kernel command line.

Among other things, that will allow utilization clamps and the
support for RT/DL tasks in the schedutil governor to be utilized on
systems in which intel_pstate is used.

    您实际上正在使用 intel_pstate CPU 频率缩放驱动程序，但它处于被动模式。尝试这个：

    echo active | sudo tee /sys/devices/system/cpu/intel_pstate/status

    然后检查：

    cat /sys/devices/system/cpu/intel_pstate/status

    如果按预期工作，则将您的 grub 行更改为：

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=active"

    看看它是否以你想要的方式启动。

    请注意，CPU 频率缩放驱动程序intel_cpufreq只是intel_pstate被动模式下的驱动程序。

    例子：

    doug@s19:~/temp$ grep . /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu10/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu11/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu1/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu2/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu4/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu5/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu6/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu7/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu8/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu9/cpufreq/scaling_driver:intel_cpufreq

doug@s19:~/temp$ cat /sys/devices/system/cpu/intel_pstate/status
passive
doug@s19:~/temp$ echo active | sudo tee /sys/devices/system/cpu/intel_pstate/status
active

doug@s19:~/temp$ grep . /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu10/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu11/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu1/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu2/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu4/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu5/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu6/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu7/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu8/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu9/cpufreq/scaling_driver:intel_pstate
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