Dear Mr. Hagemeister, today I've got my first demo-application up and running on Linux Mint 19.1 without any realtime patches.
As a first try I used the default ethernet driver (even though it's an e1000e NIC). It was much easier, than I expected. The program runs quite stable with a 1ms cycle period. I will let you know about the tests with the USB-adapter, when it has been arrived. I will do them on a Debian 9 with PREEMT_RT. Do you have any recommendations for testing the jitter? Currently I made a hardware loopback from an output to an input, and negating the signal in the control program. With my setup (EK1004 and EK2008) this results in a period of the oscillation of 8ms. With the oscilloscope I measured that period, and the according statistics (mean, min, max). Kind regards, Karl Zeilhofer On 30.04.19 10:00, Dr.-Ing. Wilhelm Hagemeister wrote: > Hallo Mr Zeilhofer, > > with a good tuned system and native driver one can realize sample rates > up to several kHz with jitter at some micro seconds. As far as I know > USB gets polled by the kernel. I would expect it can be used in a sample > rate range up to 100 Hz but we have no experience jet. May you can > discover and post your results here? > > Regards Wilhelm. > > Am 30.04.2019 um 09:49 schrieb Karl Zeilhofer: >> Dear Mr. Wilhelm, >> >> thanks for your first advices. May I ask, what do you define as "good" >> realtime behavior? >> >> Could this "bad" realtime performanc be improved by using a USB-adapter >> with a supported chipset? Or does USB (3.0) introduce inherently bad >> realtime performance? >> >> Kind regards, Karl Zeilhofer >> >> >> On 30.04.19 07:47, Dr.-Ing. Wilhelm Hagemeister wrote: >>> Hallo Mr Zeilhofer, >>> >>> generally the EtherCAT master should work with any Ethernet interface >>> which is supported by the kernel if one uses the generic driver. >>> >>> Due to the fact that the generic driver uses parts of the regular >>> network stack, don't expect good realtime behavior with an USB connected >>> adapter. >>> >>> Regards Wilhelm >>> >>> Am 30.04.2019 um 01:40 schrieb Karl Zeilhofer: >>>> Hi, >>>> >>>> has anyone experiences with running the IgH EtherCAT master via a >>>> USB-Ethernet adapter? >>>> I'm using one on one of my servers, which runs since years without >>>> problems. It uses the r8152 Ethernet driver, which is not supported. >>>> >>>> For the first tests, I don't want to configure my main Ethernet port, >>>> which is an e1000e, on my daily working machine. >>>> As far as I understood from the documentation, that Ethernet port cannot >>>> be used for the daily network traffic any more, right? >>>> >>>> If it would generally work over USB, I would buy a new adapter with one >>>> of the supported chip sets. Any recommendations? >>>> >>> _______________________________________________ >>> etherlab-users mailing list >>> [email protected] >>> http://lists.etherlab.org/mailman/listinfo/etherlab-users >> -- >> *Mechatronik* >> *Karl Zeilhofer* | Wengstraße 58 | 4643 Pettenbach >> | Austria >> *www.zeilhofer.co.at <http://www.zeilhofer.co.at/>* | >> [email protected] | +43 660 6591574 | >> *UID:*ATU64031657 >> >> ------------------------------------------------------------------------ >> >> >> >> >> >> _______________________________________________ >> etherlab-users mailing list >> [email protected] >> http://lists.etherlab.org/mailman/listinfo/etherlab-users >> > _______________________________________________ > etherlab-users mailing list > [email protected] > http://lists.etherlab.org/mailman/listinfo/etherlab-users -- *Mechatronik* *Karl Zeilhofer* | Wengstraße 58 | 4643 Pettenbach | Austria *www.zeilhofer.co.at <http://www.zeilhofer.co.at/>* | [email protected] | +43 660 6591574 | *UID:*ATU64031657 ------------------------------------------------------------------------
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