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Date:      Fri, 7 Dec 2001 23:47:59 +0100
From:      Nils Holland <nils@tisys.org>
To:        freebsd-questions@freebsd.org
Subject:   Cache, I guess...
Message-ID:  <20011207234759.A70523@tisys.org>

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Folks - 

it may sound stupid and it probably is, but I have just made a discovery
that somehow confuses me.

Now, two of my FreeBSD boxes are set up about the same, both have 512 MB of
RAM, they only differ a little in terms of CPU, mainboard and network
components used. Furthermore, both machines use the very same version of
FreeBSD - -STABLE as of last Saturday, with a kernel that is also
configured about equally (only exception: the two boxes use different NICs
and therefore the kernel configuration differs a little in that area.)

Let's now come to the IMO strange thing: I just noted that the output I get
when running top(1) on these machines differs a little. Not in terms of
numbers, but in terms of information shown:

The "Mem:" line on my first machine has six fields: Active, Inact, Wired,
Cache, Buf and Free. On my other machine, there is no "Cache" field -
everything else is the same.

Now, what does this suggest? I did not play around with any of the options
that set how to displays information. So, is my machine haunted, or am I
stupid? *Or* is there actually an explanation what is causing the stuff I have
observed and described above, and why it is the way it is?

Any suggestions are welcome! I have seen a lot of strange things and found
out what caused them, but this one somehow totally confused me...

Greetings
Nils


--- 
Nils Holland
Ti Systems - FreeBSD in Tiddische, Germany
http://www.tisys.org * nils@tisys.org

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