On Sat, Nov 27, 2021 at 10:42:27AM +0530, Raj kishore Chhatoi wrote: > Hi Team, > > We are using linuxptp-3.1 version.We are running ptp4l with Primary > configuration on a DUT and running ptp4l with salve configuration in > another DUT. Both Primary and slaves are connecetd via Radmoon Media > converter. > > We observed that Primary board is successfully sending sync(in every 125 > ms),Follow up message,PDelayResp,PdelayRespFollowUp..etc and slave also > sending Peer_Dealy_Req_message and is recived by Primary DUT. The Primary > Board system time is also successfully updating in Slave board, however we > observed that "rms" vlues in the slave board is >10000000 consistently. > > When we analyzed the sync packet we found that "LogMessagePeriod: -3" . > > Could you please let us know in which scenario/case the "LogMessagePeriod: > -3" is getting updated in sync packet ?
-3 means 2 to the power of -3 seconds which means 1/8 = 125 ms. It is the interval between Sync packets. You've mentioned this interval yourself, it is typical for the automotive profile of 802.1AS. Is that your question? > > Note : we are running "phc2sys -s eth0 -c CLOCK_REALTIME > --step_threshold=1" in slave board > > Logs: > root:~# ./ptp4l -i eth0 -f automotive-slave.cfg -m > ptp4l[291.097]: selected /dev/ptp0 as PTP clock > ptp4l[291.170]: port 1: INITIALIZING to SLAVE on INIT_COMPLETE > ptp4l[291.171]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE > ptp4l[292.108]: port 1: new foreign master 0022a0.fffe.000106-1 > ptp4l[293.030]: rms 14298871623 max 28633786542 freq +32767999 +/- 0 delay > 249550 +/- 0 > ptp4l[293.998]: rms 834329141 max 1086841975 freq +32767999 +/- 0 delay > 238995 +/- 0 > ptp4l[294.966]: rms 656424174 max 1242086770 freq +32767999 +/- 0 delay > 228440 +/- 0 > ptp4l[295.934]: rms 834413078 max 1086933599 freq +32767999 +/- 0 delay > 47601 +/- 0 > ptp4l[295.977]: selected best master clock 0022a0.fffe.000106 > ptp4l[296.992]: rms 546142504 max 1241973769 freq +32767999 +/- 0 delay > 219031 +/- 0 > ptp4l[297.919]: rms 910259892 max 1164392370 freq +32767999 +/- 0 delay > 217901 +/- 0 > ptp4l[298.893]: rms 546157036 max 1242015850 freq +32767999 +/- 0 delay > 216772 +/- 0 > ptp4l[299.867]: rms 910419317 max 1164606134 freq +32767999 +/- 0 delay > 41767 +/- 0 > ptp4l[300.821]: rms 546124273 max 1242235894 freq +32767999 +/- 0 delay > 216772 +/- 0 > ptp4l[301.735]: rms 910078978 max 1164216378 freq +32767999 +/- 0 delay > 213509 +/- 0 > ptp4l[302.709]: rms 546122078 max 1241845058 freq +32767999 +/- 0 delay > 148756 +/- 0 > ptp4l[303.682]: rms 910298081 max 1164439875 freq +32767999 +/- 0 delay > 142954 +/- 0 > ptp4l[304.651]: rms 546142664 max 1242083695 freq +32767999 +/- 0 delay > 201156 +/- 0 > ptp4l[305.551]: rms 910186093 max 1164323638 freq +32767999 +/- 0 delay > 201156 +/- 0 > ptp4l[306.524]: rms 546136673 max 1241949998 freq +32767999 +/- 0 delay > 189790 +/- 0 > ptp4l[307.498]: rms 910274018 max 1164416786 freq +32767999 +/- 0 delay > 189790 +/- 0 > ptp4l[308.472]: rms 546156330 max 1242043326 freq +32767999 +/- 0 delay > 199359 +/- 0 > ptp4l[309.381]: rms 910243669 max 1164393419 freq +32767999 +/- 0 delay > 201871 +/- 0 > ptp4l[310.282]: rms 546152446 max 1242024319 freq +32767999 +/- 0 delay > 199359 +/- 0 > ptp4l[311.182]: rms 910248741 max 1164373995 freq +32767999 +/- 0 delay > 190736 +/- 0 The path delay is very high, and has a lot of jitter (all the way from 47 us to 249 us). PTP synchronization relies on having a constant path delay and symmetric in both directions. The path delay should not be any higher than around 10 us for a 100Mbps link. My guess is that the RAD-Moon media converter is to blame for the jitter. It would be good if you could test PTP straight between two 100base-T1 ports. Also, when asking for help related to synchronization failures, it is of utmost importance to mention the kernel and driver versions you are using. Most issues come from driver bugs, and there is a chance this one is no different. _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
