Disable AMD CPU boost feature

To disable the performance boost feature on an AMD CPU, you can disable the "turbo boost" or "boost" feature, which is referred to as amd_cpufreq in Linux. You can do this by adding a kernel parameter to your bootloader configuration.

Here's how to disable the AMD performance boost for a system using GRUB2 as the bootloader:

Open the GRUB configuration file with a text editor. For example, use sudo nano /etc/default/grub if you are on a Debian-based system like Ubuntu.

Locate the line that starts with GRUB_CMDLINE_LINUX_DEFAULT. It usually contains options like "quiet splash". Add the amd_cpufreq.boost_disable=1 kernel parameter to this line. The modified line should look like:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amd_cpufreq.boost_disable=1"
```

Save the changes and exit the text editor.

Update the GRUB configuration with the new settings. On a Debian-based system, you would run:

sudo update-grub
```

On other systems, the command might be different, such as `sudo grub2-mkconfig -o /boot/grub2/grub.cfg` for Fedora.

Reboot your system for the changes to take effect:

sudo reboot
```

After rebooting, the AMD performance boost feature should be disabled. To verify that the setting is applied, you can check the contents of /proc/cmdline:

cat /proc/cmdline

The output should include the amd_cpufreq.boost_disable=1 parameter.