Hi Axel and Richard, thank you for your replies!
Huh, good question. Our setup includes four machines, all using NICs with IEEE 1588 capable chips. The little switch that connects all the machines is not capable to my knowledge, but the LAN is exclusively used for PTP synchronization. Could this still be a problem? Before we were evaluating a Windows host as the PTP Master, a machine with linuxptp was declared as the master through the algorithm. With the new PTP Master on the Windows machine all the other machines running linuxptp are slave-only. The only difference I can see is, that the PTP Master seems to be broadcasting the PTP multicasts to all NICs. This includes a NIC that is connected to another LAN that we’re using for data transfer. All the other nodes are also connected tot hat LAN, but configured through linuxptp to only use the NIC that is connected to the PTP LAN. Could this also be an issue that the master seems to broadcast the PTP messages to all connected LANs? Best regards, Patrick Von: Axel Simon <axelsi...@waymo.com> Gesendet: Mittwoch, 22. Juli 2020 15:27 An: Patrick Nowak <patrick.no...@nordsys.de> Cc: linuxptp-users@lists.sourceforge.net Betreff: Re: [Linuxptp-users] Problems syncing linuxptp slaves with Domain II Time GM Hi Patrick, the time received by ptp4l is wobbling. This could just be the effect of a network switch that is not a transparent clock and thereby delays some PTP packets more than others. You can try to connect the master and the slave directly to see if this problem goes away. Cheers, Axel On Jul 22, 2020, at 1:13 AM, Patrick Nowak <patrick.no...@nordsys.de<mailto:patrick.no...@nordsys.de>> wrote: Hello, we are currently evaluating the usage of the Greyware Domain II Time software server as a GM in our small local network. We have a seperate LAN with four nodes. One machine is running Windows and should act as a GM, getting time from NTP and serving the time via PTP. The other three nodes run linuxptp with the standard configuration. All nodes use NICs with IEEE 1588 support. The ptp4l on all nodes currently shows a frequently jumping master offset and frequency. Sometimes a message like „running in a temporal vortex" appears. An example from the syslog for the jumping values: Jul 22 10:02:50 machine1 ptp4l: [1691104.796] [0:eno1] master offset -91671 s2 freq -57292 path delay 185856 Jul 22 10:02:51 machine1 ptp4l: [1691105.695] [0:eno1] master offset -43204 s2 freq -36326 path delay 168982 Jul 22 10:02:52 machine1 ptp4l: [1691106.596] [0:eno1] master offset 54956 s2 freq +48873 path delay 168982 Jul 22 10:02:53 machine1 ptp4l: [1691107.496] [0:eno1] master offset -42141 s2 freq -31737 path delay 168982 Jul 22 10:02:54 machine1 ptp4l: [1691108.396] [0:eno1] master offset 120684 s2 freq +118445 path delay 168982 Jul 22 10:02:55 machine1 ptp4l: [1691109.296] [0:eno1] master offset -181193 s2 freq -147226 path delay 168982 Jul 22 10:02:56 machine1 ptp4l: [1691110.196] [0:eno1] master offset 47053 s2 freq +26662 path delay 168982 Jul 22 10:02:57 machine1 ptp4l: [1691111.096] [0:eno1] master offset 35055 s2 freq +28780 path delay 168982 Jul 22 10:02:57 machine1 ptp4l: [1691111.996] [0:eno1] master offset 80957 s2 freq +85198 path delay 168982 Jul 22 10:02:58 machine1 ptp4l: [1691112.896] [0:eno1] master offset -73222 s2 freq -44694 path delay 168982 Jul 22 10:02:59 machine1 ptp4l: [1691113.797] [0:eno1] master offset -35597 s2 freq -29035 path delay 168982 It seems that the nodes are communicating the network. I’ve also added a PCAP file of the PTP traffic. I am currently not really sure whats going on here or what to look for. Does anybody with a little bit more knowledge of PTP/IEEE 1588 have any ideas as to what I could further debug or change in either configurations? Best regards, Patrick <ptp.pcap.pcapng>_______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net<mailto:Linuxptp-users@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/linuxptp-users
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