Hi,
I'm having (from my perspective) too big jitter on handling
interrupts. System is: ARM9, AT91SAM9260, Kernel 2.6.20.21, Adeos
1.8-03, Xenomai-2.4.2, interrupt is generated every 1ms, externally.
Interrupt source (ET1200) is connected to IRQ1 pin (PC15). I'm using
native skin from user space. Usually, handler 'reacts' after ~110us,
but, worst case delay is around 250us! Is this performance
normal/expected on my platform? Why the difference is so huge?
Is there anything I can do to get better results (with this hw:)?
Code looks like the example provided with Xenomai:
void tmng ()
{
for (;;) {
err = rt_intr_wait(&intr_desc,TM_INFINITE);
if (err > 0) {
[..]
} else {
[..]
}
rt_intr_enable (&intr_desc);
}
}
main ()
{
err = rt_intr_create(&intr_desc, "ET1200_sync", IRQ_NUMBER, 0);
err = rt_task_create(&task_desc, "tmng", 0, 99, T_JOINABLE);
rt_intr_enable (&intr_desc);
rt_task_start(&task_desc,&tmng,NULL);
}
Thanks
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