Re: AMD, CPPC, etc

On Sat, 23 May 2026 at 01:56, Chris Torek <chris.torek@gmail.com> wrote:
>
> Commit 80d32a6b1d73 (hwpstate_amd(4): CPPC: Switch the default to
> maximum performance) cranks my 7950-based system from its 90-to-100
> watt idle draw up to 150+ watts. If I set
> dev.hwpstate_amd.0.desired_performance=0, it goes back down, so this
> isn't too big a deal, but I see that powerd has no idea about using
> the CPPC control knobs.

Would you please file a PR about powerd and CPPC control knobs?
It really should figure out what to do here. I'd much prefer that powerd
bump the CPU frequency up to the highest (eg what it does on ARM,
powerpc64 p8/p9 boxes) versus expecting the kernel to configure that
at boot.

(And have a way to do it in /etc/rc.conf too..)



-adrian