[Linuxptp-users] phc2sys doesn't update system clock anymore

[Omar P. <op...@am...>]

Dear all,
I have ubuntu 16.04 installed on two different PC , and another embedded "ARM" based system.
i have installed linuxptp 1.8 on all of them. (i'm using HW sync ptp so i configured ptp and phc as well)
the ARM system acts as master (it is connected to a gps recevier) , to obtain that it is always the Grand master i have configured its config file with a low priority1 (100).
this make it always the grand master of my network.
the system worked for several week without any problem.
i used to check the sync status with
tail -f /var/log/syslog | grep ptp
tail -f /var/log/syslog | grep phc

the output is something similar to

Dec 14 16:08:34 it-eva-driving phc2sys: [23058.294] phc offset 10512340976 s2 freq +100000000 delay 2892

and i can see the offset decreasing until reach the sync and then stay almost stable under 1 msec of delta from the master on both ptp and phc control loop.

but one day the phc stopped to work , on both PC
I mean:
tail -f /var/log/syslog | grep ptp
show , as usual, the offset decreasing and the stay stable this mean the ethernet board are in sync.

but with
tail -f /var/log/syslog | grep phc

Dec 14 16:08:34 it-eva-driving phc2sys: [23058.294] phc offset 10512340976 s2 freq +100000000 delay 2892
the offset diverge and always increase..

any idea?
thankyou
Omar

--
Omar Pighi

Sr. Engineer, VisLab


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