matrix_df hotmail wrote: > Hello Jan > > Ok, the overlong round trip times (rtt) from slave to master on my > system were introduced by the switch (Longshine LCS-FS6108).
Oh yeah. And there are people that still think real-time problems can be solved by attaching arbitrary switches. > For normal TCP/IP traffic the Longshine LCS-FS6108 switch works. I have > 2 of them. So the risk that > both are out of order is relatively small. > Do you know switches witch do not work? I can only say that using unmanaged and preferably only 8-port switches are known to introduce small bounded delays (we once measured ~10 us). They are simply too dumb to cause more harm ;) (more precisely: they are realised completely in hardware). The more intelligence they show, the more likely are rare but unexpectedly high latencies. > When using crossover rtt were ok. > I have exchanged the switch and the rtts are ok now. > > Jochen > Jan
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