Jan Kizka wrote: > Karl Reichert schrieb: > > Sorry, some mistakes, please see correct settings ... > > > >> Hi everybody, > >> > >> I have a question concerning TDMA: > >> > >> When I set up RTnet with TDMA and a cycle length of 5000 ms, I get an > >> average master jitter (difference between scheduled and real > transmission time > >> of synchronisation frames) of less then 100 us, max 160 us. > >> > > My setup was cycle length = 5000 us = 5 ms > > > >> When I do the same with cycle length 1000000 ms (1 second), I get an > >> average jitter of 8500 us (more then 8 ms). > >> > > My setup was 1000000 us = 1000 ms = 1 s > > > >> With cycle length 2 seconds, I get an average jitter of 4500 us. > >> > > My setup was 10000000 us = 10000 ms = 10 s > > > > What jitter do you get with the "latency" test running at the same > periods? > I assume we're talking about /usr/xenomai/bin/latency: With 1 ms cycle length and latency tool running, jitter is much lower, between 5-25 us.
The other two cycle lengths & latency-tool I didn't gave a try, because this seems already strang to me. I'm very busy ATM but if testing with those other cycles would help you with the problem, I could give you the values at end of august (when I'm finished with diploma). > What are the distributions of the jitters? All only around 4.5 > or 8.5 ms, or are they spread over a far wider range than with 5 ms > cycles? > I general they spread little bit, but not very much, so I don't get values higher then 5 ms / 9 ms. So this seems to be normal. > I can't look into this soon, but it has high priority for time I will > have test equipment in reach again! > Thanks Jan! Keep informed the list then, please ;) Would really like to know why this happens, although it's not so critical to my project. > Jan -- von Karl Reichert Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kanns mit allen: http://www.gmx.net/de/go/multimessenger ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
