Thx. Now I am more clear about the "context". This afternoon, I tried out with the round_trip_time test, without loading the modules: rtmac and rtcfg, but it didn't work.(The showtime simply get stuck, and did not show anyth) Do I need these modules to run this test? If I understand it correctly, rtmac and rtcfg are just two entries registered in the "rt_packets" of stack manager, as ipv4 does. So it is possible to communicate directly via ipv4, without any MAC from rtmac or distrib. configuration from rtcfg, right? Then, shall the round_trip_time test be able to run with only rtnet module and network card driver. I remeber last time I tried out with the round_trip_time test, it did work. But I used the script "rtnet", so all the modules were loaded. Could you please give me some hints about this? Thx in adv. -- Zhang Yuchen MSc. Student Control Engineering Group Faculty of Electrical Engineering University of Twente The Netherlands
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