Actually I just realized what the fault was, my proxmox boots with systemd-boot! - so of course adding kernel parameters in grub does not do anything!Will amd-pstate-epp be coming to proxmox kernels?
Kernel 6.5 is the version where it was made default but that does not seem to be the case in proxmox nor can I activate it by adding "amd_pstate=active" into grub.. Maybe there are some reasons the pstate epp driver should not be used in proxmox?
It would be really nice to get this supported to allow for more energy efficiency, or to squeze a little more performance of such amd cpus. In my testing the "epp performance performance" driver outpeforms "ahcpi performance" in peformance and slightly in efficiency and "powersave balance-performance" gets better single thread performance and higher efficiency yet but lower multicore (the rest just increase efficiency further at cost of performance), which seem to correlate with phoronix testing done on the different drivers.
I added
amd_pstate=active
into /etc/kernel/cmdline
followed by proxmox-boot-tool refresh
and a reboot and now everything works!Sorry for the noise!