Em qui., 11 de mai. de 2023 às 21:43, Richard Cochran < richardcoch...@gmail.com> escreveu: > Maybe you have ntpd or systemd timesync or chrony running on the > client and/or the server? > > IIRC Ubuntu enables systemd thing by default, and it is hard to get > rid of.
I disabled clock sync by NTP before starting these tests because I intended to manually alter the clocks as part of the tests. After altering the system clock of the master with date -s 'XX.YY', it proceeds from that without syncing with the real time. At home it occurred to me the issue could have something to do with those "time +100000000" in the log. I assumed that could be the value of a virtual clock of 100MHz that was adjusted to compensate for the delays. The negative offsets has a lower value. I guessed the positive should have a higher than +100000000 to lower the delay. What if I switched the rules of the two Fitlets? That produced the log below. Then I switched the rules again to see if I reproduced the problem. It turns out it did not. Notice the freq values are all relatively low and alternate between positive and negative values. Based on these results, it seems to me that clock value is really a delta. I had already noticed that some days ago. Yesterday, all the runs showed that +100000000 and that drift occurred. Today all the runs show a lower clock and the offset stays in the tens of us range with some a few hundreds, which is perfect for my application (1ms is good, 2.5 ms would still be pretty acceptable). Any ideas? Here is the log, snipped to avoid clutter. cve@cve-sbc-flt1:~$ sudo ptp4l -S -m -q --clientOnly=1 --step_threshold=0.001 -i enp3s0 [sudo] password for cve: ptp4l[483.312]: port 1 (enp3s0): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[483.312]: port 0 (/var/run/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[483.312]: port 0 (/var/run/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[484.261]: port 1 (enp3s0): new foreign master 0001c0.fffe.1a3cda-1 ptp4l[488.262]: selected best master clock 0001c0.fffe.1a3cda ptp4l[488.262]: foreign master not using PTP timescale ptp4l[488.262]: port 1 (enp3s0): LISTENING to UNCALIBRATED on RS_SLAVE ptp4l[490.263]: master offset -37039670930503 s0 freq -0 path delay 229600 ptp4l[491.263]: master offset -37039670924487 s0 freq -0 path delay 229600 ptp4l[492.264]: master offset -37039670928753 s0 freq -0 path delay 232188 ptp4l[493.264]: master offset -37039670917021 s0 freq -0 path delay 234777 ptp4l[494.264]: master offset -37039670952779 s0 freq -0 path delay 234777 ptp4l[495.264]: master offset -37039670932443 s0 freq -0 path delay 239541 ptp4l[496.264]: master offset -37039671053736 s0 freq -0 path delay 244305 ptp4l[497.265]: master offset -37039671066600 s0 freq -0 path delay 239541 ptp4l[498.265]: master offset -37039670962899 s0 freq -0 path delay 239541 ptp4l[499.265]: master offset -37039670952525 s0 freq -0 path delay 239065 ptp4l[500.265]: master offset -37039670957832 s0 freq -0 path delay 241685 ptp4l[501.265]: master offset -37039671028566 s0 freq -0 path delay 242272 ptp4l[502.266]: master offset -37039670976362 s0 freq -0 path delay 242272 ptp4l[503.266]: master offset -37039670953205 s0 freq -0 path delay 240855 ptp4l[504.266]: master offset -37039671002137 s0 freq -0 path delay 240855 ptp4l[505.266]: master offset -37039671039068 s0 freq -0 path delay 239652 ptp4l[506.266]: master offset -37039670976926 s1 freq -2901 path delay 239652 ptp4l[507.267]: master offset -103222 s2 freq -13326 path delay 239652 ptp4l[507.267]: port 1 (enp3s0): UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED ptp4l[508.267]: master offset -89679 s2 freq -12062 path delay 239652 ptp4l[509.267]: master offset -77666 s2 freq -10938 path delay 236179 ptp4l[510.267]: master offset -85815 s2 freq -11839 path delay 221372 ptp4l[511.267]: master offset -40116 s2 freq -7309 path delay 221372 ptp4l[512.267]: master offset -46752 s2 freq -8019 path delay 195594 ptp4l[513.268]: master offset -20651 s2 freq -5430 path delay 195101 ptp4l[514.268]: master offset 79506 s2 freq +4665 path delay 195101 ptp4l[515.268]: master offset 101894 s2 freq +7006 path delay 195101 ptp4l[516.268]: master offset 82552 s2 freq +5154 path delay 195101 ptp4l[517.269]: master offset 55103 s2 freq +2465 path delay 195101 ptp4l[518.269]: master offset 58935 s2 freq +2907 path delay 195101 ptp4l[519.269]: master offset 63706 s2 freq +3448 path delay 195594 ptp4l[520.269]: master offset 58163 s2 freq +2951 path delay 195594 ... ptp4l[2942.407]: master offset 42215 s2 freq +1370 path delay 217699 ptp4l[2943.407]: master offset 29546 s2 freq +133 path delay 217699 ptp4l[2944.407]: master offset -5205 s2 freq -3348 path delay 232956 ptp4l[2945.408]: master offset 19100 s2 freq -898 path delay 232956 ptp4l[2946.408]: master offset -75752 s2 freq -10459 path delay 232956 ptp4l[2947.408]: master offset 39169 s2 freq +1072 path delay 229773 ptp4l[2948.408]: master offset 18187 s2 freq -1008 path delay 229773 cve@cve-sbc-flt1:~$
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