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Date: Thu, 2 Oct 2008 19:03:57 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Kirk Strauser <kirk@strauser.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: More RAM for buffers?
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>
>    usable memory = 6428237824 (6130 MB)
>    avail memory  = 6203797504 (5916 MB)
>
> However, most of it is just sitting there when it looks like it could be
> used for buffers or cache:
>
> Mem: 1186M Active, 3902M Inact, 468M Wired, 233M Cache, 214M Buf, 138M Free
> Swap: 8192M Total, 900K Used, 8191M Free

i don't really know what it's actually are but "inact" are disk caches 
often.

your files are cached