[Linuxptp-users] time synchronization issue

[Rayagond K. <ray...@gm...>]

Hi All,

I am facing an issue where SLAVE system time is off by around 25-30sec
wrt MASTER system time.

Following is test setup,

a. I have connected two DUT's back to back which supports HARDWARE timestamping.
b. Changed the date and time on both the side and
c. Ran ptp4l command (ptp4l -i eth0 -p /dev/ptp0 -m) on both sides.

After ptp4l command, one DUT becomes SLAVE and other becomes
GRANDMASTER. Both are able to exchange the ptp messages.

I am able to verify that SLAVE PHC is getting synchronized to
GRANDMASTER PHC. I also verified that there is no difference between
MASTER PHC and MASTER system time,.

d. But when I run phc2sys (phc2sys -s /dev/ptp0 -w) on SLAVE side, I
could see that SLAVE system time is behind MASTER system time by
25-30sec.

Is this issue due to phcsys command ? or anything related to driver.

Please lets me know if any other points should be verified. Any other
pointers in resolving the issue would be appreciated.

Thanks and Regards,
Rayagond