Philipp Gontermann wrote: > Hi, > > we wanted to use rtnet for some hard real-time application, > but we are not shure if it will meet our requirements. > So here is the scenario: > - 2 Computer, directly connected via 100Mbit > - first one sends one package of at most 100Bytes > - second computer takes this data and does some computation > (approx. 300us) and sends back 1000Bytes > - then first one again sends data .... > > We need the responce data is available at the first > computer after at most 800us. It is necessary that NO cycle > should take make than this time. > Is it possible to meet these requirements with rtnet? > What ist the minimal roundtrip time which can be reached?
That's hardware-dependent. With typical mid-range desktops or high-end embedded industry PCs (I assume you use x86?) you can go below 1 ms cycles, and you will still have time for "real" work. Moreover, if you have a fixed traffic schedule like this one and you can waive non-rt packet tunnelling, you can skip RTmac/TDMA and gain further resources. Jan
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