avail memory is short by 1G on my FreeBSD 6.0-STABLE MP Dell

[eculp at bafirst.com]

Yesterday I did the full cvsup, build and install world, kernel, 
mergemaster, etc. on a 6.0-stable MP (2) Dell restarted and noticed on 
this mornings security run that it is only seeing 3G of the 4G that the 
box actually has (confirmed by the bios and physically).  This is not 
something new, I saw it on the initial install but it slipped my mind 
because I had a non-technical doing the initial install over skype.  If 
I had been there I would probably done a bios upgrade to see if that 
was the problem, but I'm in another country.

kernel log messages:
+++ /tmp/security.mNF3wyIb        Sun Nov 20 03:07:10 2005
+FreeBSD 6.0-STABLE #65: Sat Nov 19 03:58:47 CST 2005
+ACPI APIC Table: <DELL   PE BKC  >
+avail memory = 3151134720 (3005 MB)

I've never seen this memory issue for years.  Could there be a solution 
through configuration of the kernel, sysctl, etc.? Any and all 
suggestions appreciated.

Thanks,

ed

P.S. A copy of the dmesg is at http://unixmania.com/dmesg_20051120.txt 
don't have a verbose one.:(