Matthias Fechner wrote:
Hi,
I tested today Xenomai on my AMD64 (32-bit mode) with the latency
program from the testsuite and I got for lat min negative values.
Can my computer predict the future? :)
Of course, the timer is programmed a bit in advance taking into account
some average latency, like code run time, HW latencies, etc. It is
system dependent.
How can I interpret these values?
100 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...
RTT| 00:00:01 (periodic user-mode task, 100 us period, priority 99)
RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat worst
RTD| -1.337| -0.958| 0.970| 0| -1.337| 0.970
RTD| -1.290| -0.907| 1.959| 0| -1.337| 1.959
...
RTD| -1.406| -0.923| 1.884| 0| -1.468| 4.358
---|------------|------------|------------|--------|-------------------------
RTS| -1.468| -0.922| 4.358| 0| 00:00:34/00:00:34
Add the value listed by 'cat /proc/xenomai/latency` to the above figures
or set the latency to "1 ns" with 'echo "1" > /proc/xenomai/latency'.
Wolfgang.
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