We are running a fairly stock RHEL 6 compatible kernel using the real-time priorities and scheduler where needed.
On my desktop I have Dual core 2.2GHz with a r8169 based interface. Our customer uses a system with an i7 and dual e1000e. I'm trying to locate one of those system for further testings. On Wednesday 20 November 2013 11:34:16 Jeroen Van den Keybus wrote: > Using Xenomai and the specific patched drivers, I could easily go beyond 10 > kHz with an EK1100 and 2 EL2008 on a Core 2 Duo 2.2 Ghz with e1000. I also > did extensive measurement of delays and came up with about 6.5 us for the > IgH master and something in the order of 10 us for the NIC from transmit > start to first symbol on wire and back (last symbol on wire to receive > start). So the NIC delays are certainly appreciable as well. > > Are you running stock Linux (e.g. no RTAI, Xenomai or RT-PREEMPT) ? > > > J. > > > > 2013/11/19 Curt <cfi...@cybermetrix.com> > > > Sorry for the newbie questions. > > > > I've downloaded built and installed the ethercat master 1.5.2. > > > > Used the generic driver to communicated with an Beckhoff EK1101 hub, > > EL1034 digital input and EL2034 digital output. > > > > I then modified the ./example/user/main.c code to work with these > > modules. Seems to work OK. I then looped the digital out to a digital > > in to some basic performance testing. > > > > At a update rate of 1kHz (1 millisecond), it can detect a change on > > average of > > about 2 ms. I increased the rate to 2kHz, it can detect a change on > > average of 1ms, BUT, I see an occasional, "EtherCAT WARNING: Datagram > > da69fecc > > (domain0-0-main) was SKIPPED 1 time". I don't see this warning at a > > 1kHz update rate. > > > > Are these reasonable results, and does this imply that the fastest rate I > > can > > expect without errors/warnings is 1 kHz? > > > > Would I get significantly better results using the Ethercat kernel module > > for > > my chipset? > > > > > > Thanks, > > > > Curt Fiene > > Cybermetrix > > _______________________________________________ > > etherlab-users mailing list > > etherlab-users@etherlab.org > > http://lists.etherlab.org/mailman/listinfo/etherlab-users > _______________________________________________ etherlab-users mailing list etherlab-users@etherlab.org http://lists.etherlab.org/mailman/listinfo/etherlab-users
