linux:不能用cpupower设置cpu频率调速器

Question

我有一个带有AMD的服务器HPE ProLiant系统，BIOS A43 v1.20，带有Linux4.19.71(我也尝试了5.4.0)。现在，我正在尝试设置CPU性能调控器：

# cpupower frequency-set -g performance
    Setting cpu: 0
    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?
#

因此，我开始排除下列问题：

# cpupower frequency-info
analyzing CPU 0:
  no or unknown cpufreq driver is active on this CPU
  CPUs which run at the same hardware frequency: Not Available
  CPUs which need to have their frequency coordinated by software: Not Available
  maximum transition latency:  Cannot determine or is not supported.
Not Available
  available cpufreq governors: Not Available
  Unable to determine current policy
  current CPU frequency: Unable to call hardware
  current CPU frequency:  Unable to call to kernel
  boost state support:
    Supported: yes
    Active: yes
    Boost States: 0
    Total States: 3
    Pstate-P0:  2000MHz
    Pstate-P1:  1800MHz
    Pstate-P2:  1500MHz
#
# ls /sys/devices/system/cpu/cpufreq/
<Empty>
#
#

因此，不管出于什么原因，它都认为cpufreq驱动程序丢失了。但是，内核.config启用了以下功能：

CONFIG_CPU_FREQ=y
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_X86_ACPI_CPUFREQ_CPB=y
CONFIG_X86_INTEL_PSTATE=y
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y

我确实尝试过禁用CONFIG_X86_INTEL_PSTATE并添加CONFIG_X86_POWERNOW_K8 (当前内核中唯一特定于AMD的)，但这似乎没有帮助。

我很乐意听取你的任何建议。

Answer 1

很可能，如果您正在使用第二代EPYC CPU (罗马)，并不是所有的功能都是在内核上实现的。我不知道您使用的是哪个发行版(可以支持移植)，但是根据Ubuntu https://ubuntu.com/blog/amd-epyc-rome-support-in-ubuntu-server上的博客文章，您的内核可能无法完全支持您的CPU。

来自Ubuntu网站：

从5.4系列开始，

对AMD的支持已经合并到Linux内核中。因此，安装了5.4内核的所有Ubuntu版本都支持这个CPU及其所有新特性。然而，Canonical还支持对AMD罗马版的基本支持，以确保它们在这个新的

上正常工作。