Hello, I have a system that I am using LinuxPTP with to synchronize a very simple network. I am using Intel I210-T1 NICs, and outputting a 1-PPS signal to validate that LinuxPTP is working well. I am trying to compare the offsetFromMaster value in LinuxPTP and the 1-PPS signal, since they both measure Time Error between Master and Slave, just in different ways.
In general, I'm seeing the values are relatively close to each other (they have similar amplitudes), but in no way resemble one another. Sometimes, I see offsetFromMaster have a large abnormal jump, which I don't see happening at the PPS signal. I'm wondering why this is. Since I'm using HW Timestamping, the offsetFromMaster calculation should be doing the standard offset calculation based on the HW timestamps taken on the NIC, defined in the spec: ((t2-t1) - (t4-t3)) / 2. And the PPS Signal is asserted once per second based on the clock on the NIC I believe. What would cause discrepancies between the two measurements of Time Error? Thanks.
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