Jan Peters wrote: > Hi Jan, > > we have installed rtnet on two computers, it works but > we have a strange problem: > > When rt-pinging, we get times of 5000 to 9800 us > between them. The duration increases at every > time step. > > Do you know why that is? We want to send packages > at 200Hz, i.e., at 5000us. Do you know whats going > on there? What is a normal latency? Our loopback rtping > takes only 2-3us. >
You run RTmac/TDMA with a period of 5000 us and a single RT slot per cycle? In that case you can expect packets being sent out only every 5000 us, and if the sender is not synchronized with the TDMA cycle, you get these distribution of delays. You likely want to reduce the cycle to 2.5 ms or provide a second, joined RT transmission slot at the middle of the 5 ms cycle to fulfill your 5 ms timing requirements. Jan
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