real vs. avail memory

[Dag-ErlingSmørgrav]

I've gotten used to the fact that there is a small discrepancy between
real and available memory, but I was surprised to see the following in
dmesg on a new P4 system:

real memory  = 1073676288 (1023 MB)
avail memory = 1037799424 (989 MB)

That's a full 40 MB difference...  where does that memory go?  is it
used for page maps or something like that?

DES
-- 
Dag-Erling Smørgrav - des at des.no