Hi: I got an issue that linuxptp result doesn't match 1PPS measurement. my board is acting as a slave, the calnex is acting as a master with reference clock. after ptp4l runs, result is below, looks pretty good:
ptp4l[130166.661]: rms 1 max 2 freq -50 +/- 4 delay 9059 +/- 0 ptp4l[130167.661]: rms 1 max 1 freq -50 +/- 2 delay 9058 +/- 0 ptp4l[130168.662]: rms 1 max 2 freq -52 +/- 3 delay 9058 +/- 1 ptp4l[130169.661]: rms 1 max 3 freq -49 +/- 4 delay 9058 +/- 0 ptp4l[130170.661]: rms 1 max 2 freq -50 +/- 4 delay 9059 +/- 0 ptp4l[130171.662]: rms 1 max 2 freq -49 +/- 3 delay 9058 +/- 0 my board has 1PPS output, I connect it to the master and compared with reference PPS. however, the 1pps time error is around 40 NS, which means my board is ahead of the reference for about 40NS, which doesn't match the result dumped by ptp4l. anyone has met similar issue before? how to debug such issue? - 1ppsTE = (T1ppsMeasIngress – Dcable) - TRef https://calnexsolutions.atlassian.net/wiki/spaces/KB/pages/71991334/T-BC+Time+Error+Metrics Thanks Alex
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