[Linuxptp-users] SLAVE to UNCALIBRATED on SYNCHRONIZATION_FAULT

[Daniel Le <dan...@ex...>]

Hello,

My PTP slave clock appears to lose sync with a grandmaster clock when under heavy load and worse it can't recover. The sync is good when there is low or no other traffic. This slave clock uses software timestamping to adjust the host system time. The PTP transmit and receive packets are time stamped by a non-1588 aware NIC's FPGA clock which is sync'd to the host system clock, i.e. the NIC regularly gets host system time to step/slew to it.

The log shows:
- port <port#>: SLAVE to UNCALIBRATED on SYNCHRONIZATION_FAULT

and the following repetitive messages:
- clockcheck: clock jumped forward or running faster than expected!
- clockcheck: clock jumped backward or running slower than expected!

I would appreciate information to debug this, as well an explanation of what may be happening.

Thanks,
Daniel