Total memory vs. available memory

[Matthias Scheler <tron%zhadum.org.uk@localhost>]

        Hello,

my NetBSD/amd64 system reports these two values in kernel messages
on system startup:

total memory = 5118 MB
avail memory = 4952 MB

Out of interest: where did the 166MB go that aren't available?
Is that some PC voodoo where some memor gets lost because of some
address space conflict? I can't believe that the kernel itself
uses 166MB.

        Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/