A delay ~9ms is typical Calnex X behavior. Il giorno gio 8 set 2022 alle ore 15:29 Miroslav Lichvar <mlich...@redhat.com> ha scritto: > > On Thu, Sep 08, 2022 at 07:41:53PM +0800, Hamilton Alex wrote: > > 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. > > ptp4l is just printing the measured offset. It doesn't know the actual error. > > A measured delay of 9 microseconds is huge. That's few kilometers of > cable. What hardware do you use? Does it have PHY or MAC timestamping, > and are those errors compensated? > > -- > Miroslav Lichvar > > > > _______________________________________________ > Linuxptp-devel mailing list > Linuxptp-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
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