[Bug 256594] AMD Ryzen CPU stutter (responsiveness lag)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256594

--- Comment #17 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Andriy Gapon from comment #16)
Yes, I've observed this too when measuring TCP ping-pong latency over loopback
- latency is higher if the core was recently idle, I guess because autonomous
CPPC gradually ramps up the awoken core's performance level.  Running a
background loop on the core results in lower latency.

Unfortunately we don't have any driver (yet) to control CPPC on modern AMD
systems.

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