Thread: [Linuxptp-users] phc2sys time offset is abnormal

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Hi,&nbsp; &nbsp; I am using a embeded board, which contains a mcu and a soc. Two chips communicate through a switch chip. The mcu works as ptp master, the soc works as slave. The period of sync&amp;follow up message is 0.125s.
&nbsp; &nbsp; Here is log of ptp slave:
&nbsp; &nbsp;# ptp4l -i vlan12 -f automotive-slave.cfg -m
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[72.642]: selected /dev/ptp1 as PTP clock
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[72.684]: port 1: INITIALIZING to SLAVE on INIT_COMPLETE
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[72.684]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[74.660]: rms 366839997034620032 max 733679994069242240 freq +11485 +/- 12041 delay &nbsp;5472 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[75.660]: rms 20038 max 34097 freq -14174 +/- 6166 delay &nbsp;5559 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[76.660]: rms 10812 max 16500 freq -16497 +/- 4181 delay &nbsp;5472 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[77.660]: rms 96835 max 156626 freq +164918 +/- 44143 delay -170404 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[78.660]: rms 120039 max 178982 freq -145879 +/- 24792 delay &nbsp;5444 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[79.660]: rms 23089 max 53916 freq -62634 +/- 25815 delay &nbsp;5458 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[80.660]: rms 20165 max 25818 freq -12318 +/- 11425 delay &nbsp;5444 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[81.660]: rms 17083 max 24514 freq &nbsp;+2754 +/- 8827 delay &nbsp;5458 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[82.660]: rms 7114 max 11930 freq &nbsp;+1333 +/- 3857 delay &nbsp;5472 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[83.660]: rms 5359 max 12288 freq &nbsp;-5287 +/- 7348 delay &nbsp;5480 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[84.660]: rms 2961 max 4156 freq &nbsp;-6900 +/- 3723 delay &nbsp;5568 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[85.660]: rms 6083 max 15115 freq &nbsp;-9199 +/- 7948 delay &nbsp;5587 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[86.660]: rms 2939 max 3379 freq &nbsp;-7402 +/- 4030 delay &nbsp;5691 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[87.660]: rms 2624 max 3081 freq &nbsp;-7576 +/- 3590 delay &nbsp;5953 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[88.660]: rms 2893 max 3773 freq &nbsp;-8457 +/- 3874 delay &nbsp;6615 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[89.660]: rms 6104 max 15236 freq &nbsp;-9663 +/- 8280 delay &nbsp;7718 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[90.660]: rms 2829 max 3852 freq &nbsp;-8735 +/- 3871 delay &nbsp;9534 +/- &nbsp; 0
&nbsp; &nbsp; &nbsp; &nbsp; ptp4l[91.660]: rms 6007 max 14548 freq &nbsp;-9671 +/- 8211 delay 10710 +/- &nbsp; 0

&nbsp; &nbsp; # phc2sys -s vlan12 -c CLOCK_REALTIME -f automotive-slave.cfg &nbsp;-m -w
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[137.803]: CLOCK_REALTIME phc offset -733679957069723074 s0 freq &nbsp; &nbsp; &nbsp;+0 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[138.803]: CLOCK_REALTIME phc offset -733679957069730322 s1 freq &nbsp; -7246 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[139.803]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp;-829 s2 freq &nbsp; -8075 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[140.804]: CLOCK_REALTIME phc offset &nbsp; &nbsp; -5124 s2 freq &nbsp;-12618 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[141.804]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; 614 s2 freq &nbsp; -8417 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[142.804]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp;2093 s2 freq &nbsp; -6754 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[143.804]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; 756 s2 freq &nbsp; -7463 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[144.804]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp;1154 s2 freq &nbsp; -6839 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[145.805]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; 540 s2 freq &nbsp; -7106 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[146.805]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; 660 s2 freq &nbsp; -6824 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[147.805]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; &nbsp;51 s2 freq &nbsp; -7235 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[148.805]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; 453 s2 freq &nbsp; -6818 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[149.805]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; &nbsp;67 s2 freq &nbsp; -7068 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[150.806]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; 152 s2 freq &nbsp; -6963 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[151.806]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp;-802 s2 freq &nbsp; -7871 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[152.806]: CLOCK_REALTIME phc offset &nbsp; &nbsp; -1763 s2 freq &nbsp; -9073 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[153.806]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; 474 s2 freq &nbsp; -7365 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[154.807]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp;1207 s2 freq &nbsp; -6490 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[155.807]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; -36 s2 freq &nbsp; -7371 delay &nbsp; &nbsp;750
&nbsp; &nbsp; &nbsp; &nbsp; phc2sys[156.807]: CLOCK_REALTIME phc offset &nbsp; &nbsp; &nbsp; -66 s2 freq &nbsp; -7411 delay &nbsp; &nbsp;75

&nbsp; &nbsp; # phc_ctl vlan12 cmp
&nbsp; &nbsp; &nbsp; &nbsp; phc_ctl[197.010]: offset from CLOCK_REALTIME is -37000018280ns

&nbsp; &nbsp; # phc_ctl vlan12 cmp
&nbsp; &nbsp; &nbsp; &nbsp; phc_ctl[297.161]: offset from CLOCK_REALTIME is -36999997815ns

&nbsp; &nbsp; &nbsp; &nbsp; 
&nbsp; &nbsp; 
Q1， I can only find rms value in log of ptp4l, but no offset value. And this rms value does not converge. Is it normal? How can I get offset log?
Q2,&nbsp; as shown by the result of phc_ctl, the offset between sys time and phc time is about 37s,&nbsp; how can I fix it?

Thank you!

Thread: [Linuxptp-users] phc2sys time offset is abnormal

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