On Fri, Feb 08, 2019 at 08:22:31PM +0100, Frank Dekervel wrote: > What i observe is: > > - the computers with hardware timestamps do sync fine > - the embedded system claims to be in sync with the other computers (eg > when i do pmc -u -b 0 'GET TIME_STATUS_NP' the master_offset is less > than 100usec on the embedded system and on the other computers too) > - however, the clocks are totally not in sync (more than a minute apart > as reported by "date")
Be careful here. The `date` command compares the systems clocks, but the ubuntu system clock is not necessarily synchronized with the HW clock in the MAC. > - phc2sys is running on the ubuntu trusty computers but not on the > embedded system. But with what arguments? Which PTP clock is the master in your setup? > My question is: what could be the cause of a low master_offset but still no > clocks in sync ? I guess that the ubuntu system time is simply independent of the ubuntu PHC time. > Also, we have setup monitoring to send alerts when time is not in sync, > based on the output of "GET TIME_STATUS_NP". is this the right output to > monitor ? Yes, or you can monitor CURRENT_DATA_SET.offsetFromMaster HTH, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
