Allen Briggs wrote:
> > >Have you tried 1.4Q with the A/UX interrupts disabled?
> > Looks even worse.
> 
> I am attaching a patch to the 1.5.x version of sys/arch/mac68k/obio/esp.c.
> I'm attempting to compile with this change now, but you're welcome to
> try it.  This should make some difference, but I'm not sure how much...
> Let me know if it does help.

is there a reason why doing the operation with a bus_space_read is so much
slower than a variable dereference?

-colin