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<font face="Dialog" size="2">Hi George</font> </p>
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<font face="Dialog" size="2">We use Ubuntu 10.04 with RT_PREEMT kernels 2.6.31.11-rt or 2.6.33.9-rt (We started with 8.04 and 2.6.24, too)</font> </p>
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<font face="Dialog" size="2">Our system works on a recent Core2Duo, has an update cycle of 250µs and one domain with up to 1kB (5-20 servo drives running in cyclic position mode).</font><br><font face="Dialog" size="2">The CPU load of the realtime process is below 15%.</font> </p>
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<font face="Dialog" size="2">Do you use the generic driver or the patched ethercat e1000 driver?</font> </p>
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<font face="Dialog" size="2">If you have to use the generic driver, the interrupt throttling of the e1000 should be disabled!</font> </p>
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<font face="Dialog" size="2">Regards</font> </p>
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<font face="Dialog" size="2">Martin</font><br><br>>>> Georg Sassen <gsassen@batalpha.com> 11/5/2011 17:45 >>><br>Hi,<br><br>since we are trying to optimize our systems, some general questions<br>arise again, as perhaps the answers have changed over the time. We are<br>using Ubuntu 8.04 with RT patches, with Ubuntu stock kernel 2.6.24-rt,<br>and EtherCAT master from about a month ago.<br><br>1) Which Ethernet card is best suited for the EtherCAT master when using<br>large process data and fast EtherCAT cycles? We had some problems with<br>the E1000: When using lots (>100) of domains, we got many EtherCAT<br>datagram timeouts and the process EtherCAT-OP used nearly all of the CPU<br>(1.86GHz Celeron). This got better when we put in a cheap 8139 card -<br>but we still see these errors from time to time and don't really know<br>where they come from.<br><br>2) Is using the RT PREEMPT kernel still ok? I don't read much about<br>other people using it here, most seem to be using RTAI?<br>If using RT PREEMPT, are there any special options to be set in the<br>system or are the default settings ok?<br><br>3) Would changing to a newer kernel (like 2.6.31-rt with Ubuntu 10.04)<br>make a difference performance-wise?<br><br>Thanks<br><br> Georg<br><br><br>_______________________________________________<br>etherlab-users mailing list<br>etherlab-users@etherlab.org<br><a href="http://lists.etherlab.org/mailman/listinfo/etherlab-users">http://lists.etherlab.org/mailman/listinfo/etherlab-users</a><br>
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