[Bug 276967] sysctl dev.hwpstate_intel periodically slow

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276967

--- Comment #3 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Thomas Steen Rasmussen / Tykling from comment #2)
Yes, this is what I was looking for, but it's a symptom of the problem rather
than the root cause.  In particular, a thread is waiting to run on a particular
CPU (in order to read hwpstate MSRs) but is not getting scheduled.

It would be useful to see the full procstat output.  Then we can see what else
is on-CPU.

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