[rtl] Question on interrupts

[Maryam Moghaddas]

Hi I found the following in the RTLinux news group and found it _different_ from my results ----------------------------------------------------- 21 July 2000 daniel sheltraw wrote: > > Hello RTAIers > > Two questions: > > (1) Do RT interrupts always interrupt any RT task or is there some >     dependence on the priority level set for the task? Yes, unless the task disables them. ------------------------------------------------------------ I have a similar question/problem to this. I am using RTLinux V1. Network IRQ is registered through request_RTirq. The timestamps and tests show as if my tasks do not get preempted by the interrupt and the gap between its reception depends on the length of my tasks...   Interrupts are not disabled in tasks + tasks seem to run out of the scoop of the interrupt handler.   TEST1: task length is 300 ticks interrupt arrival: every 50 ticks sched_const 120 tick   If I send 5 messages interrupt 1 @ 50 tick interrupt 2 @ 100 task start @ 120 task end @ 420 interrupt 3 @ 430 interrupt 4 @ 470 and so on...   ****  if I increase task length:   TEST2: task length is 3000 ticks interrupt arrival: every 50 ticks sched_const 120 tick   If I send 5 messages interrupt 1 @ 50 tick interrupt 2 @ 100 task start @ 120 task end @ 3120 interrupt 3 @ 3220 interrupt 4 @ 3240 and so on     Can you explain this please?!   thanx  maryam