free memory keeps going down on 5.4-release

[Roselyn Lee]

Hi,

We're running freebsd 5-4 release and notice that an idle system's free memroy keeps decreasing.  The system has 1 GB memory and the free mem starts at ~700M and goes down steadily until it hits 2M and stays there.  After that bringing up more apps on the system doesn't seem to make the free memory any smaller.  I checked top and vmstat -m, vmstat -z and can't see where all that memory is going.  Does freebsd use memory for disk caching that is not accounted for in these stats?

Thanks in advance for any help.

Roselyn