hi, phc2sys has 3 phases 1) unlock (s0, SERVO_UNLOCKED 2) time-sync (s1, SERVO_JUMP) 3) freq-sync (s2, SERVO_LOCKED)
Based on the log capture below: Nov 10 03:49:05 phc2sys: [21956.824] CLOCK_REALTIME phc offset 8 s2 freq +9775 delay 2252 Nov 4 12:50:40 ptp4l: [21957.406] rms 3 max 5 freq +2780 +/- 5 delay 86 +/- 1 Nov 6 05:55:10 phc2sys: [21957.824] clockcheck: clock jumped backward or running slower than expected! Nov 6 05:55:10 phc2sys: [21957.824] CLOCK_REALTIME phc offset -338035766568736 s0 freq +9775 delay 2461 Nov 6 07:39:56 ptp4l: [21958.399] rms 2 max 3 freq +2783 +/- 3 delay 85 +/- 1 Nov 9 21:52:19 phc2sys: [21958.824] CLOCK_REALTIME phc offset -21408060435248 s0 freq +9775 delay 2468 Nov 9 21:52:19 ptp4l: [21959.393] rms 3 max 6 freq +2784 +/- 4 delay 84 +/- 1 Nov 9 21:52:20 phc2sys: [21959.825] CLOCK_REALTIME phc offset -21408060435245 s2 freq +9772 delay 2472 Actual time as received by ptp4l from GM is Nov 10 03:49 (1636516145) But system time is somehow got changed to Nov 9 21:52 (1636494740) Offset between two (ptp4l and system time) is 21408 seconds. So when the phc2sys moves from s0 to s2 via s1 phase, it should have set the system time to proper value based on below code (clockadj_step). case SERVO_JUMP: clockadj_step(clock->clkid, -offset); if (clock->sanity_check) clockcheck_step(clock->sanity_check, -offset); /* Fall through. */ case SERVO_LOCKED: But it still remained on Nov 9 21:52. What is wrong here? Nov 9 21:52:20 ptp4l: [21960.382] rms 3 max 6 freq +2776 +/- 2 delay 86 +/- 1 Nov 9 21:52:21 phc2sys: [21960.825] CLOCK_REALTIME phc offset -21408060435252 s2 freq -100000000 delay 2488 Nov 9 21:52:21 ptp4l: [21961.429] rms 3 max 6 freq +2778 +/- 5 delay 86 +/- 0 Nov 9 21:52:22 phc2sys: [21961.825] CLOCK_REALTIME phc offset -21407969493862 s2 freq -100000000 delay 2709 Nov 9 21:52:22 ptp4l: [21962.520] rms 3 max 7 freq +2784 +/- 4 delay 85 +/- 1 Please suggest. regards, Ramesh _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
