[Linuxptp-users] Software timestamping delay - master offset drift
PTP IEEE 1588 stack for Linux
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[Linuxptp-users] Software timestamping delay - master offset drift
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From: Elder C. <eld...@ti...> - 2023-05-11 16:02:10
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I had already notice this while trying to solve the clock sync issue of the other thread. Test setup is two Fitlet PCs, connected point-to-point. The master offset increases, non monotonically but with a very definite trend, whether with or without the step_threshold parameter. $ uname -srvm Linux 5.15.0-70-generic #77~20.04.1-Ubuntu SMP Wed Apr 5 09:38:34 UTC 2023 x86_64 $ ptp4l -v 3.1-00246-g5498f74 What am I missing? $ sudo ptp4l -S -m -q --clientOnly=1 --step_threshold=0.01 -i enp3s0 ptp4l[17804.187]: port 1 (enp3s0): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[17804.188]: port 0 (/var/run/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[17804.188]: port 0 (/var/run/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[17805.578]: port 1 (enp3s0): new foreign master 0001c0.fffe.1a3e8e-1 ptp4l[17809.579]: selected best master clock 0001c0.fffe.1a3e8e ptp4l[17809.579]: foreign master not using PTP timescale ptp4l[17809.579]: port 1 (enp3s0): LISTENING to UNCALIBRATED on RS_SLAVE ptp4l[17810.584]: master offset 159453 s0 freq +100000000 path delay 216530 ptp4l[17811.584]: master offset 204915 s0 freq +100000000 path delay 216530 ptp4l[17812.585]: master offset 253667 s0 freq +100000000 path delay 210875 ptp4l[17813.585]: master offset 216052 s0 freq +100000000 path delay 222827 ptp4l[17814.585]: master offset 218133 s0 freq +100000000 path delay 222827 ptp4l[17815.585]: master offset 238977 s0 freq +100000000 path delay 218369 ptp4l[17816.585]: master offset 243903 s0 freq +100000000 path delay 218369 ptp4l[17817.585]: master offset 161090 s0 freq +100000000 path delay 218369 ptp4l[17818.585]: master offset 243281 s0 freq +100000000 path delay 218369 ptp4l[17819.585]: master offset 252487 s0 freq +100000000 path delay 218369 ptp4l[17820.585]: master offset 243551 s0 freq +100000000 path delay 215088 ptp4l[17821.586]: master offset 253522 s0 freq +100000000 path delay 216985 ptp4l[17822.586]: master offset 254771 s0 freq +100000000 path delay 216985 ptp4l[17823.586]: master offset 236767 s0 freq +100000000 path delay 216985 ptp4l[17824.586]: master offset 260883 s0 freq +100000000 path delay 215088 ptp4l[17825.586]: master offset 231376 s0 freq +100000000 path delay 215088 ptp4l[17826.586]: master offset 279783 s1 freq +100000000 path delay 208463 ptp4l[17827.586]: master offset -4948 s2 freq +99999500 path delay 208463 ptp4l[17827.586]: port 1 (enp3s0): UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED ptp4l[17828.586]: master offset -26034 s2 freq +99997366 path delay 208463 ptp4l[17829.586]: master offset 9262 s2 freq +100000000 path delay 196545 ptp4l[17830.587]: master offset -64129 s2 freq +99993492 path delay 196545 ptp4l[17831.587]: master offset 8086 s2 freq +100000000 path delay 180968 ptp4l[17832.587]: master offset 19802 s2 freq +100000000 path delay 180968 ptp4l[17833.587]: master offset 25994 s2 freq +100000000 path delay 196545 ptp4l[17834.587]: master offset 33958 s2 freq +100000000 path delay 180968 ptp4l[17835.587]: master offset -43154 s2 freq +99995546 path delay 187560 ptp4l[17836.587]: master offset 24553 s2 freq +100000000 path delay 187560 ptp4l[17837.587]: master offset 22863 s2 freq +100000000 path delay 209257 ptp4l[17838.588]: master offset -6513 s2 freq +99999204 path delay 214778 ptp4l[17839.588]: master offset 25468 s2 freq +100000000 path delay 212728 ptp4l[17840.588]: master offset 31602 s2 freq +100000000 path delay 206895 ptp4l[17841.588]: master offset 31784 s2 freq +100000000 path delay 206895 ptp4l[17842.588]: master offset 14909 s2 freq +100000000 path delay 211621 ptp4l[17843.588]: master offset 25457 s2 freq +100000000 path delay 211621 ptp4l[17844.588]: master offset 5632 s2 freq +100000000 path delay 211621 ptp4l[17845.589]: master offset 43463 s2 freq +100000000 path delay 208242 ptp4l[17846.589]: master offset 42612 s2 freq +100000000 path delay 208242 ptp4l[17847.589]: master offset 22200 s2 freq +100000000 path delay 211621 ptp4l[17848.589]: master offset 26093 s2 freq +100000000 path delay 211507 ptp4l[17849.589]: master offset -67089 s2 freq +99993079 path delay 211507 ptp4l[17850.589]: master offset 18941 s2 freq +100000000 path delay 211507 ptp4l[17851.589]: master offset 53578 s2 freq +100000000 path delay 211507 ptp4l[17852.589]: master offset 41217 s2 freq +100000000 path delay 212352 ptp4l[17853.589]: master offset -29075 s2 freq +99996852 path delay 212352 ptp4l[17854.590]: master offset 63911 s2 freq +100000000 path delay 212352 ptp4l[17855.590]: master offset 48070 s2 freq +100000000 path delay 213941 ptp4l[17856.590]: master offset -15308 s2 freq +99998213 path delay 211507 ptp4l[17857.590]: master offset 52932 s2 freq +100000000 path delay 211507 ptp4l[17858.590]: master offset 72178 s2 freq +100000000 path delay 210398 ptp4l[17859.590]: master offset -25048 s2 freq +99997214 path delay 211507 ptp4l[17860.590]: master offset 59028 s2 freq +100000000 path delay 210398 ptp4l[17861.591]: master offset 83153 s2 freq +100000000 path delay 210398 ptp4l[17862.591]: master offset -15561 s2 freq +99998147 path delay 209111 ptp4l[17863.591]: master offset 87904 s2 freq +100000000 path delay 206645 ptp4l[17864.591]: master offset 14074 s2 freq +100000000 path delay 206645 ptp4l[17865.591]: master offset 110231 s2 freq +100000000 path delay 194703 ptp4l[17866.591]: master offset 23757 s2 freq +100000000 path delay 194703 ptp4l[17867.591]: master offset 20245 s2 freq +100000000 path delay 179716 ptp4l[17868.591]: master offset 18863 s2 freq +100000000 path delay 179716 ptp4l[17869.591]: master offset 95764 s2 freq +100000000 path delay 174219 ptp4l[17870.591]: master offset 49927 s2 freq +100000000 path delay 174219 ptp4l[17871.592]: master offset 140161 s2 freq +100000000 path delay 172870 ptp4l[17872.592]: master offset 26294 s2 freq +100000000 path delay 174498 ptp4l[17873.592]: master offset 34713 s2 freq +100000000 path delay 172870 ptp4l[17874.592]: master offset 24618 s2 freq +100000000 path delay 172870 ptp4l[17875.592]: master offset 152488 s2 freq +100000000 path delay 171713 ptp4l[17876.592]: master offset 32740 s2 freq +100000000 path delay 174498 ptp4l[17877.592]: master offset 118871 s2 freq +100000000 path delay 171713 ptp4l[17878.592]: master offset 160898 s2 freq +100000000 path delay 170332 ptp4l[17879.593]: master offset 157665 s2 freq +100000000 path delay 171767 ptp4l[17880.593]: master offset 19963 s2 freq +100000000 path delay 217720 ptp4l[17881.593]: master offset 93649 s2 freq +100000000 path delay 217720 ptp4l[17882.593]: master offset 108074 s2 freq +100000000 path delay 220966 ptp4l[17883.593]: master offset 87514 s2 freq +100000000 path delay 220966 ptp4l[17884.593]: master offset 77271 s2 freq +100000000 path delay 215470 ptp4l[17885.593]: master offset 114914 s2 freq +100000000 path delay 215470 ptp4l[17886.593]: master offset 98124 s2 freq +100000000 path delay 215470 ptp4l[17887.593]: master offset 129160 s2 freq +100000000 path delay 215470 ptp4l[17888.594]: master offset 100582 s2 freq +100000000 path delay 215470 ptp4l[17889.594]: master offset 125095 s2 freq +100000000 path delay 215110 ptp4l[17890.594]: master offset 124738 s2 freq +100000000 path delay 215110 ptp4l[17891.594]: master offset 106051 s2 freq +100000000 path delay 215500 ptp4l[17892.594]: master offset 126470 s2 freq +100000000 path delay 215500 ptp4l[17893.594]: master offset 131971 s2 freq +100000000 path delay 215500 ptp4l[17894.594]: master offset 48569 s2 freq +100000000 path delay 215500 ptp4l[17895.594]: master offset 134499 s2 freq +100000000 path delay 215500 ptp4l[17896.595]: master offset 134927 s2 freq +100000000 path delay 215771 ptp4l[17897.595]: master offset 57682 s2 freq +100000000 path delay 219586 ptp4l[17898.595]: master offset 137885 s2 freq +100000000 path delay 214427 ptp4l[17899.595]: master offset 141448 s2 freq +100000000 path delay 213856 ptp4l[17900.595]: master offset 157021 s2 freq +100000000 path delay 208183 ptp4l[17901.595]: master offset 127072 s2 freq +100000000 path delay 212943 ptp4l[17902.595]: master offset 153837 s2 freq +100000000 path delay 206355 ptp4l[17903.595]: master offset 86728 s2 freq +100000000 path delay 212943 ptp4l[17904.595]: master offset 53300 s2 freq +100000000 path delay 197715 ... ptp4l[18856.714]: master offset 1642006 s2 freq +100000000 path delay 210466 ptp4l[18857.714]: master offset 1638704 s2 freq +100000000 path delay 210466 ptp4l[18858.714]: master offset 1562520 s2 freq +100000000 path delay 209583 ptp4l[18859.715]: master offset 1658159 s2 freq +100000000 path delay 205885 ptp4l[18860.715]: master offset 1658522 s2 freq +100000000 path delay 196826 ptp4l[18861.715]: master offset 1548773 s2 freq +100000000 path delay 196826 ptp4l[18862.715]: master offset 1661950 s2 freq +100000000 path delay 185949 ptp4l[18863.715]: master offset 1671314 s2 freq +100000000 path delay 185949 ptp4l[18864.715]: master offset 1674822 s2 freq +100000000 path delay 185949 ptp4l[18865.715]: master offset 1596681 s2 freq +100000000 path delay 185949 ptp4l[18866.716]: master offset 1666690 s2 freq +100000000 path delay 185949 ptp4l[18867.716]: master offset 1670159 s2 freq +100000000 path delay 185949 ptp4l[18868.716]: master offset 1649541 s2 freq +100000000 path delay 196826 ptp4l[18869.716]: master offset 1558798 s2 freq +100000000 path delay 196826 ptp4l[18870.716]: master offset 1688908 s2 freq +100000000 path delay 185949 ptp4l[18871.716]: master offset 1666295 s2 freq +100000000 path delay 185949 ptp4l[18872.716]: master offset 1668525 s2 freq +100000000 path delay 185635 ptp4l[18873.717]: master offset 1673801 s2 freq +100000000 path delay 200040 |
