On Mon, Aug 17, 2020 at 08:34:29PM +0000, Irene Kravets wrote: > Output of phc_ctl eth0: > > phc_ctl[28.658]: > capabilities: > 250000000 maximum frequency adjustment (ppb) > 0 programable alarms > 0 external time stamp channels > 0 programmable periodic signals
Your PHC has zero periodic output signals available. This means that this hardware cannot produce a high quality PPS output. > has pulse per second support This a "virtual" PPS time stamp delivered to the kernel. It can be used by phc2sys or ntpd in order to discipline the Linux system time. However, it is not a great source of an output PPS signal. I guess your PPS comes from here, and the 2-3 microsecond delay is to be expected. Sorry, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
