[Bug 276967] sysctl dev.hwpstate_intel periodically slow

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 11 Feb 2024 14:47:29 UTC

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
                 CC|                            |markj@FreeBSD.org
             Status|New                         |Open

--- Comment #1 from Mark Johnston <markj@FreeBSD.org> ---
The sysctl handler uses sched_bind() to pin itself to a CPU.  This is fragile
and can take "forever" if a higher-priority thread is monopolizing the CPU. 
Assuming this is the problem here, we should modify the handler to use an IPI

When the problem occurs, is there high CPU usage?  Output from "procstat -kka"
during a hang would be useful.

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