RTAI provides its scheduling accuracy in part by trapping all normal Linux interrupts. I am guessing that the USB system
is producing interrupts that RTAI can not trap. It appears that there are interrupts generated by the USB system that function
at a level below the usual Linux interrupt handling system.
Is this true and if so why is it necessary?
You said you enabled USB in the BIOS. So maybe that's what you're seeing: (SMI) IRQs handled by BIOS. If you're handling USB through Linux instead, it's not doing anything special.
- Dave
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