[Bug 255261] Slow unmount of (ZFS) filesystem at reboot time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255261

--- Comment #3 from Peter Eriksson <pen at lysator.liu.se> ---
(In reply to dgilbert from comment #2)

Ah, sorry. Wasn't really clear there. The fix for that other problem is already
in the normal FreeBSD 12.2 kernel. 

Information about that fix (from FreeBSD 11.3) is in bug 242427
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242427) - however that is
something that happens after all the filesystems are unmounted.

For a machine with more modest amounts of zfs filesystems (3000) then the
unmounting is much quicker (in my tests) - like 3000 filesystems unmounted in
10 seconds. That is for a fairly recently rebooted (same hardware as the slow
one - a HP DL380g9 with 512-768GB of RAM and 140 10TB drives on the big one and
10 10TB drives on the small one.

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