Dear all,
I am running a serial port test in xenomai (xenomai-2.5.5.2) using 16550A
driver.
In my program, I am calling
rt_dev_ioctl(dev_id, RTSER_RTIOC_WAIT_EVENT, & rx_event);
when an event happens, I use clock_gettime(CLOCK_MONOTONIC, & curr_time)
to get the current time. The program runs continuosly in a while loop. In this
way, I
measure the elapsed time between the previous and current events.
For this test, I find something that I still cannot figure out. They are as
follows:
1st session running the program, elapsed time between events - 40 us (reboot
system)
2nd session - 80 us (reboot
system)
3rd session - 150 us (reboot
system)
4th session - 100 us (reboot
system)
and so on.
And I use clock_getres to see the resolution of the clock, tv_sec = 0, tv_nsec
= 1.
My question is - why everytime I reboot the system, I get different elapsed
time
measurement for the same program?
Can someone please help ?
Regards,
Ph293
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