>I have 64MB RAM, but I noticed this in the log:
>Nov 23 03:22:50 jupiter /netbsd: real mem  = 66711552
>Nov 23 03:22:50 jupiter /netbsd: avail mem = 61386752
>what happened to the 5mb?

Mostly buffer cache?  Plus any other little bits of memory the kernel
needed to grab while booting?

I have my machine set to 15% buffer cache.  This is what I see:

NetBSD 1.2 (MINDBENDER) #403: Thu Nov  7 23:58:48 PST 1996
    michaelv@MindBender.serv.net:/u/src/sys/arch/i386/compile/MINDBENDER
CPU: Pentium (GenuineIntel 586-class CPU)
real mem  = 66715648
avail mem = 53440512
using 2430 buffers containing 9953280 bytes of memory
[etc....]

-----------------------------------------------------------------------------
  Michael L. VanLoon                           michaelv@MindBender.serv.net
        --<  Free your mind and your machine -- NetBSD free un*x  >--
    NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
        Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
    NetBSD ports in progress: PICA, others...
-----------------------------------------------------------------------------