$FreeBSD: stable/11/usr.bin/top/top.local.1 318449 2017-05-18 13:19:07Z allanjude $
Mem: 61M Active, 86M Inact, 22G Wired, 1M Cache, 2M Buf, 102G Free ARC: 15G Total, 9303M MFU, 6155M MRU, 1464K Anon, 98M Header, 35M Other 15G Compressed, 27G Uncompressed, 1.75:1 Ratio, 174M Overhead Swap: 4096M Total, 532M Free, 13% Inuse, 80K In, 104K Out

K: Kilobyte

M: Megabyte

G: Gigabyte

%: 1/100

Active: number of bytes active

Inact: number of bytes inactive

Wired: number of bytes wired down, including BIO-level cached file data pages

Cache: number of clean bytes caching data that are available for immediate reallocation

Buf: number of bytes used for BIO-level disk caching

Free: number of bytes free

These stats are only displayed when the ARC is in use.

Total: number of wired bytes used for the ZFS ARC

MRU: number of ARC bytes holding most recently used data

MFU: number of ARC bytes holding most frequently used data

Anon: number of ARC bytes holding in flight data

Header: number of ARC bytes holding headers

Other: miscellaneous ARC bytes

Compressed: bytes of memory used by ARC caches

Uncompressed: bytes of data stored in ARC caches before compression

Ratio: ratio of uncompressed data to total ARC size

Overhead: amount of overhead from ARC compression

Total: total available swap usage

Free: total free swap usage

Inuse: swap usage

In: bytes paged in from swap devices (last interval)

Out: bytes paged out to swap devices (last interval)