Lei Zhao wrote: > Hi Jan, thank you for your quick reply :) > > When you say that "There are a few benchmarks around on the web, many > in German only :-/", do you mean that (1) there are systems running > RTnet which have been benchmarked (in which case a link or two would > be fantastic) or (2) there are benchmarks for which to measure RTnet > against?
Well, those who are running full networks did not publish their test results (or I'm not aware of them). One example for a micro-benchmark I know from the heart: http://linuxdevices.com/articles/AT7365224759.html Here is a recent example for a German publication, sadly with a systematic mistake (uses Linux gettimeofday instead of RT-safe services for time stamping): http://public.fh-wolfenbuettel.de/~schneibe/stuff/prozkomm.pdf One standard test that already comes with RTnet is under examples/xenomai/posix/rtt-*. Another one used to be what is now only in SVN under examples/broken/event/: An extension of rtt that measures the clock synchronisation accuracy based on a hardware signal that was distributed to all nodes' parallel ports. Further resources that might be useful for benchmarks: - RTcap (real-time capturing add-on for RTnet to check packet timing) - /proc/xenomai/stat (average load of RT tasks and IRQs) - http://www.xenomai.org/index.php/I-pipe:Tracer (kernel function tracer, can help to explore worst-case code paths) Specifically as the tool situation improved recently, there is enough food for anyone eager to benchmark various aspects of latest RTnet. Jan
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