Am 28.09.2010 23:17, Glen Wernersbach wrote: > Jan, > > My basic concern was to keep the data flowing from the NIC to my program as > close to hard real time as possible. I know doing Linux calls can break hard > real time especially when I want to receive a UDP packet every 1ms.
Is that UDP packet part of your control loop? Why do you need the whole opener stack then? Or is there more? > > The only thing Ethernet IP really gives you real time is optional support > for the Ethernet 1588 timing standard so you know what the jitter was in > receiving the packet over the Ethernet line. The 1588 support is not yet > implemented in opener. The rest is just a protocol for handling critical > data over TCP and UDP. Unfortunately, I have a device that needs to work on > Allen Bradley controllers which only support this real time protocol. > > All I want to do is replace the Linux calls in networkhandler.c > (socket,bind,listen...) with RTAI real time calls. Additionally, you will have to configure the socket resources, namely how many buffers each socket should pre-allocate for its real-time operation (that's the major difference to normal networking stack that do on-demand allocations). See the examples. Jan
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