Hi Matthias Schöpfer I have seen the same problem. I am also running at 1 ms and using clock_nanosleep.
I suspect that the problem arise when you send a new telegram before you have received the previously send telegram. Which version of the ethercat are you using? Which version of kernel are you using? Best regard, Thomas Winding -----Original Message----- From: etherlab-dev [mailto:etherlab-dev-boun...@etherlab.org] On Behalf Of Dr.-Ing. Matthias Schöpfer Sent: 26. januar 2016 14:22 To: etherlab-dev@etherlab.org Subject: [etherlab-dev] Possible Realtime Issues with Ethercat Master and RT Preempt Kernel Hi! We started using etherlab/ethercat and are quite impressed. Nice work! We are running Linux with a RT_PREEMPT Kernel and e1000e ethercat driver. We have to run at a cycle time of 1ms and we have jitter from clock_nanosleep of about 15 microsecs max. Nevertheless, we suffer from time to time from these: EtherCAT WARNING 0: 2 datagrams UNMATCHED! EtherCAT 0: Domain 0: Working counter changed to 9/9. EtherCAT 0: Domain 0: Working counter changed to 0/9. Especially, when we apply load to the system. From previous projects, I experienced these effects when IRQ/Kernel Thread was not set to appropriate RT Level. My Question: has anybody experienced similar problems, and would it be worth to investigate it. And if I decide to patch the kernel module, where is a good starting point. Thanks and regards, Matthias Schöpfer -- Dr. Matthias Schöpfer mz robolab GmbH Marie-Curie-Str. 1 53359 Rheinbach Office: +49 2226 83600 00 Fax: +49 2226 83600 11 Email: schoep...@robolab.de mz robolab GmbH Vertretungsberechtigte Geschäftsführer: Dr. Rüdiger Maaß, Ralf Schulte Registergericht Amtsgericht Bonn Registernummer HRB 10595 --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is strictly forbidden. Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. --- P please consider the environment before printing this e-mail _______________________________________________ etherlab-dev mailing list etherlab-dev@etherlab.org http://lists.etherlab.org/mailman/listinfo/etherlab-dev _______________________________________________ etherlab-dev mailing list etherlab-dev@etherlab.org http://lists.etherlab.org/mailman/listinfo/etherlab-dev
