I just committed a change from Ross which fixes a pretty serious bug
in software interrupt processing, whereby interrupts were being blocked
while software interrupts were being processed.  This of course is wrong,
and would have had a serious impact on serial performance.

The bug is now fixed, so if you are using the serial lines on your
Alphas for e.g. PPP, you might notice a fairly major improvement in
ferformance now.

Have fun!

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>