[Bug 243946] mdconfig -d causes iostat glitch

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243946

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|12.1-RELEASE                |CURRENT
                 CC|                            |cem at freebsd.org

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
Yep.  The iostat interface is sort of inherecently racy, but we might be able
to do a better job in this specific case.

(Even the stats collection in the kernel is racier than it has to be.  If you
have a fast enough device, some starts and stop counts can be lost and you end
up with similar overflow numbers.)

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