On Thu, 11 Jun 1998 23:45:35 -0400 
 "Perry E. Metzger" <perry@piermont.com> wrote:

 > I don't care much about the VAX. What I care about is next year's
 > system that requires flexibility in ways that having the VAX work
 > taught us to accomodate. As it stands, we work on virtually everything 
 > that can be thrown about us -- and these days, building a new port is
 > becoming a cookie cutter operation, with massive code sharing.

Running on insanely slow hardware also motivates you to improve the
performance of your kernel :-)

I recall that Ragge (the VAX port gooroo) posted that his uVAX-II ran
/etc/rc something like 10 or 15 seconds faster w/ UVM :-)

Also, I recall that the Arm32 guys, Mark and Neil (who John indirectly
referred to earlier, in case you didn't know) observed quite a noticeable
performance boost w/ UVM, and after making some changes to their pmap
suggested by Chris Demetriou and Chuck Cranor (IIRC - I was put in the loop
on the mail exchange, and I'm pretty sure he posted to port-arm32 about it),
got additional performance gains near the _50%_ range!

Can't wait to run that code on my Shark :-)

Jason R. Thorpe                                       thorpej@nas.nasa.gov
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