cpu at base frequency

[alexandere]

The system is a fresh install of proxmox 7.2 with all updates installed

I'm using /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_info to monitor the current cpu frquency: but the frquency is always the base frequency of the cpu

The scaling governor is set to performance, after changing the governor to powersave the frequency is stuck at a lower frequency.

Is this a hardware or software issue, how to debug?

specs:
mb: Supermicro H12SSL-NT
cpu: Epyc 7443p
kernel: 5.15.35-1-pve (also present with 5.15.30-2-pve)

 

[Dunuin]

Look at the kernel documentation: https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt
Powersave = your CPU will always run at the lowest clock
Performance = your CPU will always run at the highest clock

PVE 7.2 should use "Schedutil" by default (they switched defaults from performance to schedutil with PVE 7.0 o 7.1 if I remember right) which will dynamically switch frequencies between min and max clock depending on the load.

 

[alexandere]

Thank you, I changed the scaling governor back to schedutil.

/sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_info is now reporting both the base (2.85Ghz) and the lower (1.5Ghz).

I expect to see higher boost frequencies.

 

[Dunuin]

2,85GHz is your base clock. If it never boosts check your BIOS/UEFI. With all my older X10 Intel Supermicro boards here I needed to allow boosting there.

 

[alexandere]

I checked the bios/uefi settings, but they seem correct.

After that I tried to monitor the frequency trough "/proc/cpuinfo", here I see the 4Ghz+ I expect (see image).

sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_info still shows the base 2.85Ghz speed.

Is this a kernel issue?

 

[Neobin]

PVE 7.2 should use "Schedutil" by default (they switched defaults from performance to schedutil with PVE 7.0 o 7.1 if I remember right)

This change [1] got reverted [2] really quick.

[1] https://forum.proxmox.com/threads/proxmox-ve-7-0-released.92007/page-6#post-402309
[2] https://forum.proxmox.com/threads/proxmox-ve-7-0-released.92007/page-7#post-402467