Hello everyone,
I am trying to sync different Ubuntu computers to the ptp master clock from
another device connected to each of them.
The setup is very easy:
Ubuntu Laptop as Slave <-> Ubuntu device with GPS signal as Master
The problem is that for one system, everything is working right, but for other
system with the same setup, when the date is updated it is set to a day in
2018, which is obviously not the case. I also had some offset issues that I
believe are solved already by using phc2sys with the -O 0 option (0seconds
offset).
Here are the steps that I follow:
Master
ptp.cfg file:
[global]
tx_timestamp_timeout 10
step_threshold 1
user@MK6C:~$ timedatectl
Local time: Wed 2022-03-23 16:38:27 UTC
Universal time: Wed 2022-03-23 16:38:27 UTC
RTC time: Wed 2022-03-23 16:38:28
Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
systemd-timesyncd.service active: no
RTC in local TZ: no
sudo ptp4l -A -i eth0 -m -f ptp.cfg
ptp4l[101681.741]: selected /dev/ptp0 as PTP clock
ptp4l[101681.742]: driver changed our HWTSTAMP options
ptp4l[101681.742]: tx_type 1 not 1
ptp4l[101681.742]: rx_filter 1 not 12
ptp4l[101681.742]: port 1: INITIALIZING to LISTENING on INITIALIZE
ptp4l[101681.743]: port 0: INITIALIZING to LISTENING on INITIALIZE
ptp4l[101681.743]: port 1: link up
ptp4l[101689.067]: port 1: LISTENING to MASTER on
ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[101689.067]: selected best master clock 04e548.fffe.230104
ptp4l[101689.067]: assuming the grand master role
Slave-1
linuxptp.cfg file:
[global]
clientOnly 1
delay_mechanism Auto
network_transport UDPv4
#time_stamping hardware # for the HW-timestamping slave
#time_stamping software # for the SW-timestamping slave
step_threshold 1.0
utc_offset 37
# make sure our slave clock is never elected as master
priority1 255
priority2 255
[enp0s31f6]
sudo ptp4l -s -f linuxptp.cfg -m
ptp4l[105105.227]: selected /dev/ptp0 as PTP clock
ptp4l[105105.228]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[105105.228]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[105105.894]: port 1: new foreign master 04e548.fffe.230104-1
ptp4l[105109.894]: selected best master clock 04e548.fffe.230104
ptp4l[105109.894]: running in a temporal vortex
ptp4l[105109.895]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[105111.895]: master offset -18633 s0 freq +24199 path delay 267
ptp4l[105112.895]: master offset -18834 s2 freq +23998 path delay 267
ptp4l[105112.895]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[105113.895]: master offset -18827 s2 freq +5171 path delay 267
ptp4l[105114.895]: master offset -22 s2 freq +18328 path delay 262
ptp4l[105115.895]: master offset 5676 s2 freq +24019 path delay 262
ptp4l[105116.895]: master offset 5669 s2 freq +25715 path delay 257
ptp4l[105117.895]: master offset 3948 s2 freq +25695 path delay 262
ptp4l[105118.895]: master offset 2246 s2 freq +25177 path delay 267
ptp4l[105119.895]: master offset 1066 s2 freq +24671 path delay 267
ptp4l[105120.895]: master offset 363 s2 freq +24288 path delay 288
ptp4l[105121.895]: master offset 79 s2 freq +24113 path delay 273
ptp4l[105122.895]: master offset -36 s2 freq +24021 path delay 273
ptp4l[105123.895]: master offset -63 s2 freq +23984 path delay 268
edge2@dai-edge2:~$ timedatectl
Local time: Mon 2018-01-29 20:52:35 UTC
Universal time: Mon 2018-01-29 20:52:35 UTC
RTC time: Mon 2018-01-29 20:52:35
Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
NTP service: inactive
RTC in local TZ: no
sudo phc2sys -s enp0s31f6 -O 0 -m
edge2@dai-edge2:~$ sudo phc2sys -s enp2s0 -O -36 -m
phc2sys[105266.195]: CLOCK_REALTIME phc offset -72 s0 freq +31297 delay
5547
phc2sys[105267.196]: CLOCK_REALTIME phc offset -131 s2 freq +31238 delay
5503
phc2sys[105268.196]: CLOCK_REALTIME phc offset -70 s2 freq +31168 delay
5574
phc2sys[105269.197]: CLOCK_REALTIME phc offset 17 s2 freq +31234 delay
5481
phc2sys[105270.197]: CLOCK_REALTIME phc offset 102 s2 freq +31324 delay
5588
phc2sys[105271.197]: CLOCK_REALTIME phc offset 60 s2 freq +31313 delay
5590
phc2sys[105272.198]: CLOCK_REALTIME phc offset 58 s2 freq +31329 delay
5559
phc2sys[105273.198]: CLOCK_REALTIME phc offset 22 s2 freq +31310 delay
5569
^Cphc2sys[105274.179]: CLOCK_REALTIME phc offset -66 s2 freq +31229
delay 5546
edge2@dai-edge2:~$ timedatectl
Local time: Mon 2018-01-29 20:53:33 UTC
Universal time: Mon 2018-01-29 20:53:33 UTC
RTC time: Mon 2018-01-29 20:53:33
Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
NTP service: inactive
RTC in local TZ: no
This is working correctly in one setup but in other two I get this weird 2018
date set.
Am I missing something? Any help would be very appreciated. Thanks in advance!
Best regards,
Federico Murciano
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