A Dimarts 27 Març 2007 19:49, Jan Kiszka va escriure: [....] > > > > Could I have a better numbers or are so good? > > Well, you are also measuring a black box - VxWorks. I don't know how > that OS internally realised its networking stack and what priority it > assigns to ICMP (ping) packets. > > You should have a look at the network traffic first, ideally by sniffing > with a third node that is sharing the net via a *hub*, or by listening > on the RTnet node via RTcap (see README.rtcap). You may also do your > measurements via UDP, using the protocol you actually want to apply on > the control job. Maybe UDP shows a better latency in VxWorks.
ok, I think that the best test I can do is a real test between the two boxes. I suppose that I will not have any problem doing a communication between a a rtnet socket in the rtai box and a "normal" socket in the VxWorks ..... > > Pd looking on the dmesg I found this message, it's important? > > > > RTnet: initialising real-time networking > > PCI: Found IRQ 11 for device 0000:00:0e.0 > > rteth0: 0000:00:0e.0, 00:A0:C9:1D:52:B9, IRQ 11. > > *** Receiver lock-up bug detected *** > > Your device may not work reliably! > > RTnet: registered rteth0 > > initializing loopback... > > Take it as a safety note: Your Intel PRO/100 NIC /may/ lock-up in its > receiver state machine. Normal NIC drivers have a timer that can recover > from this, but for RT, this is generally already far too to late, > deadlines have been missed then. I don't know the concrete boundary > conditions for this hardware bug, but I also failed to watch it with our > hardware in real life over the last 5 years or so. > Ok, thanks. Regards, Leo ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ RTnet-users mailing list RTnet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rtnet-users
