s/guile/guide/g Sorry...
ciao luigi Il giorno gio 8 set 2022 alle ore 13:56 Luigi 'Comio' Mantellini < luigi.mantell...@gmail.com> ha scritto: > Hi Alex, > > some guile line that I follow during my debug sessions: > > - Are you using a good cable-delay estimation for your cable? (Consider > ~5ns/m for classical eth cables) I suggest you to physically measure the > delay and place it as Dcable cell in Calnex configuration. > - Have you checked about any asymmetry between RX and TX paths? Can you > short-circuit your timestamper to check? You need to ask your FPGA and HW > experts. > - How is the 1PPS driven? Is there any reclocking logic? You need to ask > your FPGA-experts. > > > ciao > > luigi > > > Il giorno gio 8 set 2022 alle ore 13:44 Hamilton Alex < > alexzanda...@gmail.com> ha scritto: > >> 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 >> >> _______________________________________________ >> Linuxptp-devel mailing list >> Linuxptp-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/linuxptp-devel >> > > > -- > *Luigi 'Comio' Mantellini* > My Professional Profile <http://www.linkedin.com/in/comio> > > *"UNIX is very simple, it just needs a genius to understand its > simplicity." [cit.]* > > -- *Luigi 'Comio' Mantellini* My Professional Profile <http://www.linkedin.com/in/comio> *"UNIX is very simple, it just needs a genius to understand its simplicity." [cit.]*
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