hi
I'm using linux-rt, 5.4.41, at91 sam9x35 (single core).
AFAIK, the hrtimer_interrupt must run at HW context, and could not be
threaded.
On my system, hrtimer_interrupt processing takes ~100us in average,
~40us in best case and ~200us in worst case. when adding the overhead of
the re-scheduling that follow each interrupt, we get to worst case
overhead of ~250us for the hrtimer_interrupt.
This worst case and the huge variance are too high for some of my
threaded interrupts, which have to record timestamps of HW events with
precision < 100us.
Digging in documentation and mailing lists, I didn't find any solution...
Any idea on how to overcome this problem?
With best regards
Yosi Yarchi
