Hello. I'm trying to synchronize time using one computer as master and another as slave.
The command used is as follows. [Master] ./ptp4l -i eno1 -m ./phc2sys -a -r -r -m [Slave] ./ptp4l -i ens4f0 -s -m ./phc2sys -a -r -r -m The output is as follows. [Master] root@democtl:~/linuxptp-3.1.1# ./ptp4l -i eno1 -m ptp4l[5347.666]: selected /dev/ptp0 as PTP clock ptp4l[5347.666]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[5347.667]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[5354.018]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES ptp4l[5354.019]: selected local clock 3cecef.fffe.0f0e54 as best master ptp4l[5354.019]: port 1: assuming the grand master role root@democtl:~/linuxptp-3.1.1# ./phc2sys -a -r -r -m phc2sys[5354.077]: port 3cecef.fffe.0f0e54-1 changed state phc2sys[5354.077]: reconfiguring after port state change phc2sys[5354.077]: selecting eno1 for synchronization phc2sys[5354.077]: selecting CLOCK_REALTIME as the master clock phc2sys[5354.077]: eno1 sys offset 157769435242960916 s0 freq +5100 delay 838 phc2sys[5355.078]: eno1 sys offset 157769435242960918 s1 freq +5102 delay 836 phc2sys[5356.078]: eno1 sys offset -1804 s2 freq +3298 delay 833 phc2sys[5357.078]: eno1 sys offset 1 s2 freq +4562 delay 834 phc2sys[5358.078]: eno1 sys offset 531 s2 freq +5092 delay 830 phc2sys[5359.079]: eno1 sys offset 535 s2 freq +5255 delay 825 phc2sys[5360.079]: eno1 sys offset 373 s2 freq +5254 delay 834 phc2sys[5361.079]: eno1 sys offset 220 s2 freq +5213 delay 836 phc2sys[5362.079]: eno1 sys offset 108 s2 freq +5167 delay 837 phc2sys[5363.080]: eno1 sys offset 35 s2 freq +5126 delay 830 phc2sys[5364.080]: eno1 sys offset 0 s2 freq +5102 delay 836 [Slave] root@demo1:~/linuxptp-3.1.1# ./ptp4l -i ens4f0 -s -m ptp4l[1989.882]: selected /dev/ptp7 as PTP clock ptp4l[1989.889]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[1989.889]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE ptp4l[1991.183]: port 1: new foreign master 3cecef.fffe.0f0e54-1 ptp4l[1995.183]: selected best master clock 3cecef.fffe.0f0e54 ptp4l[1995.183]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE ptp4l[1997.183]: master offset 419811980807575924 s0 freq +0 path delay 23 ptp4l[1998.183]: master offset 419811980807584081 s1 freq +8156 path delay 23 ptp4l[1999.183]: master offset -17 s2 freq +8139 path delay 23 ptp4l[1999.183]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED ptp4l[2000.183]: master offset -1921 s2 freq +6230 path delay 1964 ptp4l[2001.183]: master offset 0 s2 freq +7575 path delay 1964 ptp4l[2002.183]: master offset 393 s2 freq +7968 path delay 2165 ptp4l[2003.183]: master offset 466 s2 freq +8158 path delay 2264 ptp4l[2004.183]: master offset 475 s2 freq +8307 path delay 2266 root@demo1:~/linuxptp-3.1.1# ./phc2sys -a -r -r -m phc2sys[2001.023]: reconfiguring after port state change phc2sys[2001.023]: selecting CLOCK_REALTIME for synchronization phc2sys[2001.023]: selecting ens4f0 as the master clock phc2sys[2001.023]: CLOCK_REALTIME phc offset 419812022665851840 s0 freq +0 delay 942 phc2sys[2002.024]: CLOCK_REALTIME phc offset 419812022665812900 s1 freq -38932 delay 932 phc2sys[2003.024]: CLOCK_REALTIME phc offset 543 s2 freq -38389 delay 940 phc2sys[2004.024]: CLOCK_REALTIME phc offset 772 s2 freq -37997 delay 939 phc2sys[2005.024]: CLOCK_REALTIME phc offset 769 s2 freq -37769 delay 937 phc2sys[2006.025]: CLOCK_REALTIME phc offset 560 s2 freq -37747 delay 941 phc2sys[2007.025]: CLOCK_REALTIME phc offset 257 s2 freq -37882 delay 945 phc2sys[2008.025]: CLOCK_REALTIME phc offset 62 s2 freq -38000 delay 938 phc2sys[2009.025]: CLOCK_REALTIME phc offset -14 s2 freq -38057 delay 935 phc2sys[2010.026]: CLOCK_REALTIME phc offset -87 s2 freq -38134 delay 942 phc2sys[2011.026]: CLOCK_REALTIME phc offset -108 s2 freq -38182 delay 942 phc2sys[2012.026]: CLOCK_REALTIME phc offset -51 s2 freq -38157 delay 937 phc2sys[2013.026]: CLOCK_REALTIME phc offset -26 s2 freq -38147 delay 935 phc2sys[2014.027]: CLOCK_REALTIME phc offset 7 s2 freq -38122 delay 945 phc2sys[2015.027]: CLOCK_REALTIME phc offset 14 s2 freq -38113 delay 935 I have the following questions: 1. What is the difference between the delay output from phc2sys and the path delay output from ptp4l of the slave? I know the path delay as the expected delay time of the sync message sent from the Master, but I'm not sure about the concept of delay. 2. If you change the master's time arbitrarily while PTP time is synchronized by entering the command written above (example: change the time randomly by entering date -s '2012-01-01 00:00:00' in the master) Is there a way for the Slave to automatically synchronize accordingly? (Or is there an option to synchronize it to the master's clock every specific period?) Any advice would be appreciated.
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