ZFS ARC tuning (was: "failed to reclaim memory" with much free physmem)

<<On Sat, 13 Sep 2025 04:02:01 +0100, Graham Perrin <grahamperrin@gmail.com> said:

> Also, might one of the following be a better alternative?

> vfs.zfs.arc_free_target

> vfs.zfs.arc.sys_free

The former *sounds* like it might be a reasonable lever, although I
still feel like there's some sort of accounting issue here.  I note on
my systems the latter is zero, but the former has a positive value
(which seems to be related to memory size).

-GAWollman