>
> Plus, NetBSD has performance improvements in some
> areas that may make up for losses in others, and will gain even more
> over time. Anyone looked at supporting UVM on NetBSD/vax?
> 
Yes, I have fixed support for it, it will go in later this weekend.
It decreased the rc run-time on my MVII with 10 seconds, from 1m50s
to 1m40s :-) This may also be because of much fewer calls to the 
pmap functions in UVM; a function calls takes 20-30uS on a MVII.

About benching; I did some tests back in -94 when I first had NetBSD
up and running. I don't remember any numbers anymore, but compared to
4.3 Reno the VM system was a great improvement; especially when creating
new processes, the Mach VM is also much better in caching. Probably the
swap allocation and copying that takes time.
Also; 4.3 lacks mmap() so "you loose" if you want to use some smarter
programs.

-- Ragge