Slobodan Matic wrote: >> You could also run rtping at a higher rate (-i ...), something that is >> equivalent to the TDMA cycle. > > > I ran 'rtping -i 1 ...' without any error or packet loss. This way the > packets were sent/received five times more often than with the TDMA protocol > which fails. > > >> Mmh, SMP... Could you give this also a try with maxcpus=1 (or without >> CONFIG_SMP)? Just to check if we see some SMP-related race. > > > The same thing again. When I boot both machines with maxcpus=1 kernel option > I again have the TDMA failure (with rtnet start), and again rtping works > correctly. > > >> Then some tracing will be required next, in order to gain overview what >> happens around the out-of-rtskb situation. What kernel are you on, what >> hal (==ipipe) version? > > > I work with 2.6.23 kernel (#1 SMP x86_64) because that is the latest kernel > that RTAI 3.6 supports for the x86_64 architecture. The I-pipe is, I guess, > version 1.4-03 (when rtai is loaded it prints: RTAI[hal]: <3.6.1> mounted > over IPIPE-NOTHREADS 1.4-03).
OK, that's a bit old, so let's start tracing at a different level: Could you collect the network traffic on both sides via RTcap? That will already give an overview of what master and slave send out and what the actually see. You may have to patch the scripts a bit to add early capturing (i.e. start tcpdump along with the capturing interfaces). > BTW, one thing that I mentioned in the first email is that when I load rtnet > module I get the following warning: 'rtnet: no version for "struct_module" > found: kernel tainted'. No other errors are reported. Do you think this > might be relevant, and if yes, how to correct it? Unless you actually compile against a different kernel than you run, this brokenness is harmless. Jan
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