Giudici, Marina wrote:
Hello, I'm working with Real Time Workshop and RtaiLab.
I need to manage my local network, so I need to write new custom blocks
using s-functions. I suppose that I have to use RTNet calls in my blocks. Am
I right? Are there examples about menaging a lan with RTW and RtaiLab? Or is
anybody doing my same thing? I've never done net programming so I think I'll
need some help.. :)
You have to do nothing but install RTNet, all the rest comes by itself. Read NETRPC README.
There is a whole activity here at DIAPM on the subject, see: http://www.aero.polimi.it/~mbdyn/mbdyn-rt/index.html.
Interesting page! I will put a link on the RTnet homepage if it's ok. Paolo, do you already have some more background information about the hard real-time part of the network (configuration, benchmark figures, traps, pitfalls, or other experiences)? It would also be interesting to get on overview of the wire protocol of NetRPC. Knowing the communication characteristics will become helpful for system designers when scheduling the time slot on the real-time network (future versions of RTnet will add more flexibility to the RTmac disciplines).
Although NetRPC is undoubtedly a very useful transparent communication mechanism, I think it's worth noting again that, as an additional abstraction layer, it can introduce noticeable overhead when exchanging lager amounts of data or calling RPC's too frequently (due to additional copy-steps and acknowledge packets). For certain scenarios, e.g. when using lower-end PCs (Pentium I class or worse), shared memory models or other application-specific protocols may be necessary to save resources.
Jan
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