Slobodan Matic wrote: > On Sat, Nov 8, 2008 at 1:30 PM, Jan Kiszka <[EMAIL PROTECTED]> wrote: > >> Please generate pcap files (tcpdump -w). They can be read by Wireshark - >> and even interpreted (Wireshark has RTnet support). You can try the >> same, of course. > > > Hi Jan, > Ok, I generated the files with the -w option (attached MndMS from master and > SndMS from slave). I also tried to analyze the files with Wireshark.
Analysis can be easier if you only trace on rteth0, not on all interfaces. That excludes unrelated noise and avoids duplications due to rtmac capturing interfaces. > The files show that, as expected, the following messages are sent/received: > Stage 1 Config, New Announce, Stage 2 Config, Acknowledge, Ready (M), Ready > (S). > The master then just continues with a sequence of Synchronisation messages > and, after some time, it also sends a Dead Station message. > Then the entire cycle of messages is repeated. The files show two such > cycles. OK, so the slave does not see any packets, not even sync frames after the final rtcfg ready message. But the master tries to send out those frames. Strange. Though I have a vague feeling that I've faced such an effect long time ago as well - but it's only a feeling, no idea what might have been the reason. > The similar traces are generated if a hub is used instead of a switch. > Any hint? Thanks. I think you now have to look into what happens on the master after the ready, but before out-of-rtskb is detected. Is the driver code that issues the packet actually executed? Are interrupts still coming in from the NIC? You may use good old printk for it, or (less messy) the ipipe tracer. See http://www.xenomai.org/index.php/I-pipe:Tracer for more details. A possible trace pattern could be to trigger on a function that is only executed after the final ready (=>/proc/ipipe/trace/trigger) and set appropriately large post_trace_points. Such trace can also nicely be discussed here (the storm of information may not immediately be interpretable). Jan
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