On the offset issue… one of the benefits of having so many ports, and several
of hardware based NTP units (thanks Leo/Anthony!) is that I have been able to
replicate the issue by connecting serval ports directly from host to host with
and without an intervening switch. I’ve also been able to test different
chipsets. The short version of all the tests is that there is clear asymmetry
with hardware timestamps. Based on research and the fact that the asymmetry
varies with chipset, my best guess is that the hardware tx/rx timestamps are
incorrect and need compensation in the driver. The 4.8.X kernel introduced
compensation for the i210, but not for the i211 or the i354 (which I am testing
with). I have a query into the Intel folk about this and will let you know what
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