Should a UFS machine have an ARC entry in top?

From: bob prohaska <fbsd_at_www.zefox.net>
Date: Sat, 29 Jan 2022 20:43:13 UTC 
I just noticed a new line in top's output on a Pi3 running 13/stable:

ARC: 3072B Total, 2048B MRU, 1024B Header
     2048B Compressed, 20K Uncompressed, 10.00:1 Ratio

This is on a Pi3 with a UFS filesystem, near as I can
tell ARC is something to do with ZFS; have I got something
misconfigured?

The system was last updated in mid January. 
 
Thanks for reading, apologies if it's a dumb question!
 
bob prohaska
>