https://pve.proxmox.com/pve-docs/pve-admin-guide.html----
3.13.6. Editing the Kernel Commandline
You can modify the kernel commandline in the following places, depending on the bootloader used:
GRUB
The kernel commandline needs to be placed in the variable GRUB_CMDLINE_LINUX_DEFAULT in the file /etc/default/grub. Running update-grub appends its content to all linux entries in /boot/grub/grub.cfg.
Systemd-boot
The kernel commandline needs to be placed as one line in /etc/kernel/cmdline. To apply your changes, run proxmox-boot-tool refresh, which sets it as the option line for all config files in loader/entries/proxmox-*.conf.
A complete list of kernel parameters can be found at
https://www.kernel.org/doc/html/v<YOUR-KERNEL-VERSION>/admin-guide/kernel-parameters.html. replace <YOUR-KERNEL-VERSION> with the major.minor version, for example, for kernels based on version 6.5 the URL would be:
https://www.kernel.org/doc/html/v6.5/admin-guide/kernel-parameters.htmlYou can find your kernel version by checking the web interface (Node → Summary), or by running
# uname -r
Use the first two numbers at the front of the output.