ZFS devouring RAM in less than 2 days on FBSD 11.2

[ASV]

Hi all,
I've upgraded to FreeBSD 11.2 (11.2-RELEASE-p8 at present time) and
I've set the following parameters, the latter manually lowered to try
to limitate the memory devouring process, unsuccessfully:

vfs.zfs.arc_min: 1342177280
vfs.zfs.arc_max: 10737418240

my old server has 16GB of RAM and after less than 2 days 14GB are
already wired. It seems to me that ZFS ignores completely the 'arc_max'
parameter.

Anybody is experiencing the same?
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