For reference, the output of phc2sys running for a good number of hours with a 60 second report window: https://pastebin.com/YEra3LCK
[cid:image001.png@01D8C352.92E38AF0] Brian Lilly / Senior Firmware Engineer Email: bri...@neuralynx.com From: Brian Lilly <bri...@neuralynx.com> Sent: Tuesday, September 6, 2022 1:21 PM To: linuxptp-users@lists.sourceforge.net Subject: [Linuxptp-users] Help with what is undoubtedly a problem with my configuration Some background: I'm building a Petalinux image (Xilinx' Yocto project based build system thing) that includes linuxPTP. I have it starting as a service, and subsequently, I also have phc2sys running to synchronize the system clock to the clock from eth0 and my PTP master. This seems to be working, to some degree. Problem is that the behavior is erratic, to say the least. For example: phc2sys[46.726]: CLOCK_REALTIME phc offset -93776 s2 freq +32031 delay 1020 phc2sys[47.727]: CLOCK_REALTIME phc offset -83999 s2 freq +32168 delay 1020 phc2sys[48.727]: CLOCK_REALTIME phc offset -119501 s2 freq +27423 delay 1020 phc2sys[49.727]: CLOCK_REALTIME phc offset -479032 s2 freq -13320 delay 1020 phc2sys[50.727]: CLOCK_REALTIME phc offset -1923240 s2 freq -176973 delay 1020 phc2sys[51.727]: CLOCK_REALTIME phc offset -3395674 s2 freq -358174 delay 1020 phc2sys[52.727]: CLOCK_REALTIME phc offset -3394547 s2 freq -392006 delay 1010 phc2sys[53.728]: CLOCK_REALTIME phc offset -2828314 s2 freq -363666 delay 1010 phc2sys[54.728]: CLOCK_REALTIME phc offset -2187172 s2 freq -321424 delay 1020 phc2sys[55.728]: CLOCK_REALTIME phc offset -1661911 s2 freq -285517 delay 1020 Eventually failing with a timeout since it can't synchronize the system or PTP hardware clock. The PTP daemon is just chugging along, in a temporal vortex: ptp4l[1037]: ptp4l[246.499]: master offset 29510 s2 freq +64760 path delay 265538 ptp4l[1037]: ptp4l[247.499]: master offset -20951 s2 freq +23152 path delay 265538 ptp4l[1037]: ptp4l[248.499]: master offset -23629 s2 freq +14188 path delay 265538 ptp4l[1037]: ptp4l[249.499]: master offset -40569 s2 freq -9840 path delay 275390 ptp4l[1037]: ptp4l[250.499]: master offset -64721 s2 freq -46163 path delay 275390 ptp4l[1037]: ptp4l[251.500]: master offset 90752 s2 freq +89894 path delay 275390 ptp4l[1037]: ptp4l[252.499]: master offset 10070 s2 freq +36437 path delay 275390 ptp4l[1037]: ptp4l[253.499]: master offset -65171 s2 freq -35783 path delay 275390 ptp4l[1037]: ptp4l[254.499]: master offset 12986 s2 freq +22823 path delay 275390 ptp4l[1037]: ptp4l[255.499]: master offset -40304 s2 freq -26571 path delay 269316 The service file for phc2sys looks like this: [Unit] Description=Synchronize system clock or PTP hardware clock (PHC) After=network-online.target [Service] Type=forking ExecStart=/usr/sbin/phc2sys -w -s eth0 -c CLOCK_REALTIME -P 0.1 -I 0.01 -m [Install] WantedBy=multi-user.target And the service file for ptpd: [Unit] Description=ptpd time precision daemon After=network-online.target StartLimitIntervalSec=1 [Service] Type=forking EnvironmentFile=/etc/default/ptpd ExecCondition=systemctl disable ntpd ExecStart=/usr/sbin/ptp4l -i eth0 -s -m PIDFile=/run/ptp41 Restart=always [Install] WantedBy=multi-user.target I'm sure that the issue lies with something obvious and stupid that I've done, only that I can't put my finger on what specifically that is. If more information is needed, I'm happy to provide it. Thank you for your help.
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