Hi,
I tried to understand why our test with Michael's "measuraments" did
had, contrary to what he said, a lot of jitter. It turned out that the
cause was that somebody took away the "r_cli" that is there while
setting it up for RTAI.
So be warned that to compensate jitter you must, not only schedule in
advance substantially, but keep interrupt disabled for all the critical
part of your task, INPUT-OUTPUT TO THE EXTERNAL WORLD INCLUDED. In fact
in the sw test if you do not keep the outb whitin interrupts disabled
the jitter is unchanged even if you schedule precisely. That clear it is
easily understood that such a techniques is, for me, not acceptable for
computer intensive real time.
Ciao, Paolo
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