In article <200304221008.31432.darcy@NetBSD.org>,
D'Arcy J.M. Cain <darcy@NetBSD.org> wrote:
>Anyone have any ideas about this message?  If we reduce the memory to 2GB the 
>problem goes away.
>
>cpu0: serial number 0000-068a-0000-d683-c4b9-1876
>total memory = 3967 MB
>panic: cpu_startup: cannot allocate VM for buffers
>Stopped in pid 0 ( ) at cpu_debugger +0x4: leave

maybe we need to clamp nbuf to let's say 8000?
try doing so in machdep.c...

christos