We are still running into issues where irq0 is using a lot of CPU  
time. The same threads on an RTAi system on the same hardware used  
about 13% of the CPU but are using closer to 60% on Xenomai. I know  
there is some overhead with userspace calls but hte irq0 handler alone  
accounts for 20% of it. Are there any options that can speed things up?

We've tried both one shot and periodic modes. I confirmed that the ISA  
i/o timing is 1.3usec per outb as expected.


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