[Bug 229670] Too many vnodes causes ZFS ARC to exceed limit vfs.zfs.arc_max (high ARC "Other" usage)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229670

--- Comment #17 from Leif Pedersen <leif at ofWilsonCreek.com> ---
In 11, I could lower vfs.zfs.arc_max without rebooting. If I lowered it below
the current allocation, it'd whack out a bunch of cached data to get within the
new setting (maxvnodes problem notwithstanding).

In 12, it seems I can't lower it below the current allocation. In practice,
this means one will rarely be able to lower it without rebooting (since one
wouldn't be trying to lower it on a running system unless it was already so
large it was causing a problem). It was nice to be able to change it to make
more room for hungry things like InnoDB without rebooting.

Is that intentional? I guess there may be a good reason why, or maybe it backs
off automatically better than in 11?

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