Hi,
I’ve finally been able to check out the new AMD P-State driver that gives control over boosting on a per-logical core basis and it’s pretty damn cool. I put together the attached script that allows for controlling the boost and a few other pm-related settings from the command-line.
zentrol-2025010900.zip (2.2 KB)
Control is at the per-CPU/CCD/CCX/Core level. So you can do something like:
$ sudo zentrol ccd 0 scaling_governor performance
to set the scaling governor to ‘performance’ for all cores on CCD 0; or something like:
$ sudo zentrol ccx 4 pstate.status guided
to set the operation mode of the P-State driver to ‘guided’ for all the cores in CCX 4; or:
$ sudo zentrol core 10 boost disabled
to disable boosting (CPB) on just logical core 10; or:
$ zentrol cpu 0 boost
to show whether boost is enabled or disabled for each core on CPU 0
There’s also the builtin command ‘read.docs’ which will attempt to bring up a copy of the P-State driver documentation, which explains what the different settings and values do.
I’ve only tested it on a 1-CCD Zen 2 and a 2-CCD Zen 3 chip, but if my assumptions are correct, it should scale up to Threadripper and even multi-socket EPYC.
In order to use this util you will need to be running at least kernel 6.11 and have the amd-pstate driver loaded and active. To see which driver is currently in use, simply run:
$ zentrol cpu 0 scaling_driver
I may keep hacking on it or it may be feature complete for now, but I wanted to share it in case anyone else found it useful. Any testing or feedback is welcome 
Edit, new version: Accounted for the Zen-based, Hygon Dhyana, but then forgot to account for the Hygon Dhyana lol; also tweak the help to be more consistent
Edit2: Fix a cut-n-paste typo in the ‘sd’ code; tighten up ‘read.docs’ a tad