First of all: The issue is resolved.The EVB-LAN7430 seems to work just fine and it was me who performed a bad wireshark dump. The EVB-LAN7430 is the grandmaster (GM) and I also dumped the packages with this device. Since timestamping for one-step-sync happens in hardware, it is most probable that wireshark dumps only the non-timestamped packages.
When I dump the packages with another device, everything looks fine!
Furthermore, I haven't configured ptp4l optimally to be a GM (Thanks to Dennis Hagarty for pointing that out!) Therefore, I configured ptp4l similarly to the "GPS NTP+PTP Network Time Server (TM2000A)" with the following /etc/ptp4l.conf:
[global] verbose 1 time_stamping hardware slaveOnly 0 priority1 128 priority2 128 logging_level 6 boundary_clock_jbod 0 twoStepFlag 0 logSyncInterval -7 logMinDelayReqInterval -7 clockClass 6 offsetScaledLogVariance 0xFFFF # Within 1 us clockAccuracy 0x23 [enp9s0] delay_mechanism E2E network_transport UDPv4 Greetings, Timo On 30.06.20 04:37, Timo Korthals wrote:
I've attached the wireshark dump to this message.On Tuesday, June 30, 2020 04:32 CEST, "Timo Korthals" <tkorth...@cit-ec.uni-bielefeld.de> wrote:Dear linuxptp users, I'd like to set up the EVB-LAN7430 [1] as a PTP grandmaster, which serves the system's time to some embedded devices with one-step-sync. I've noticed that the time in the embedded devices will be set accordingly, but with a random offset of 0.5 to 30 seconds (therefore, no UTC or TAI issue). I assume, that the issue lies in the empty "Sync Message" which is send by the EVB-LAN7430, according to [2]. Please find a wireshark dump between one embedded device and the EVB-LAN7430 attached. Have I miss-configured something, or is the EVB-LAN7430 still not capable of one-step-sync? By the way: The manufacturer of the embedded devices promised, that one-step-sync works with a dedicated grandmaster (that sends non-emtpy "Sync Messages"). Here is my minimal system setup: - ptp4l 2.0-00155-g61c6a70 build from a recent commit [3] - Ubunt 18.04 with Kernel 5.6.15-050615-generic - First, running `sudo ./phc2sys -c enp9s0 -s CLOCK_REALTIME -w -m -O 0` - Secondly, running `sudo ./ptp4l -m -l7 -4 -H -i enp9s0 -E -f /etc/ptp4l.conf` - with /etc/ptp4l.conf -- [global] -- priority1 127 -- twoStepFlag 0 Kind regards, Timo [1] https://www.microchip.com/DevelopmentTools/ProductDetails/PartNO/EVB-LAN7430 [2] https://tekron.com/news/release/1-step-vs-2-step-ptp/ [3] https://github.com/richardcochran/linuxptp/commit/61c6a708980217119e829e4b41ea2504e673e4fb -- Timo Korthals, M.Sc. Universität Bielefeld AG Kognitronik & Sensorik Exzellenzcluster Cognitive Interaction Technology (CITEC) Inspiration 1 (Zehlendorfer Damm 199) 33619 Bielefeld - Germany Phone : +49 521 106-67367 eMail : tkorth...@cit-ec.uni-bielefeld.de Internet: http://www.ks.cit-ec.uni-bielefeld.de/_______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
-- Timo Korthals, M.Sc. Universität Bielefeld AG Kognitronik & Sensorik Center for Cognitive Interaction Technology (CITEC) Inspiration 1 (Zehlendorfer Damm 201) 33619 Bielefeld - Germany Website : https://sites.google.com/view/timokorthals
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