M. Koehrer wrote: > Hi everbody, > > I have made a test that allows to reproduce the issue (enclosed to this mail). > You need two PCs that run the rtnet software. > The test is written for RTAI-3.3cv, however it should be easy to move it > to xenomai. > > One of the PCs acts as server. This one should have the eepro100 board, as > this is the candidate that > shows the buggy behaviour. > The other PC acts as client. This one can have any rtnet-support NIC (I use > also a eepro100 for it). > Both PCs are connected via an cross-over cable. > The test sequence is the following: > Client Server > ---- 1472 ----> > ---- 32 ----> > <---- 800 ----- > The client sends two UDP messages, one with 1472 the second with 32 byte data. > The server confirms the reception of both messages by a 800 byte response. > This test will be repeated permanently. Whenever the reception of the > second message fails, it will be printed out (dmesg to see the results). > On my system, it takes about 280 microseconds for one cycle. > > The test is realized in two kernel modules, to ease startup I have also > written > two scripts. > Please read the readme.txt in the archive. > > The shorter the second frame is, the more often the critical situation > appears. > It takes only a few seconds on my system to get the error (especially if some > other process is doing lot of harddisk/ethernet action on the server PC). > > Perhaps there is anybody out there that could run this test. > Interesting could be, if it behaves the same under xenomai. >
I ported it over (Native user-space) and gave it a first try. Archive is attached. So far this was without "success", i.e. everything works as it should (almost everything, but that's an unrelated story). Test scenario here: Pentium 266 <-> Pentium 700 (tried both roles for each node) Kernel 2.6.17.13, i-pipe-1.5-00, Xenomai trunk, RTnet 0.9.6 Load on the server: "latency" test + "find /" (CF-card as disk, rather low IRQ load). I have no 2.4 system at hand (more precisely: no working libc), so I cannot test in this direction. Another question is if the system speed (specifically of the 266 MHz box) has any influence. When time permits I will try on some other boxes as well, but that may take a few days. Jan
rtnettest.tgz
Description: GNU Unix tar archive
signature.asc
Description: OpenPGP digital signature
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