2.0.x is OK with the sync card even when its being at its most obnoxious
(square waving the irq line).
2.1.x uniprocessor is Ok providing you build with SMP=0 - ie when its using
hardware cli/sti and SA_INTERRUPT. The latency is still much worse for some
reason. Probably the interrupt return path as the entry path is pretty clean
2.1.x SMP with one CPU or more than one recurses through the entire kernel
space and explodes. I'll try and debug this in more detail if I can catch
the machine enough to see what happened.
Anyway Im now off to look at putting the notion of fast interrupt and
probably syscall returns back into 2.1.x.
Alan
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