[sneak]

For bonus points, hook up a GPS with a PPS output to the local one so it's stratum 1.

[willis936]

I do this, with all the trimmings (running in kernel space, PTP simulation, etc). I appreciate that a good estimation of the time inside the non-deterministic OS is being made, but I haven't quite wrapped my head around what it means to extract the time from that non-deterministic OS.

How big is that unmeasured error?

[karlshea]

I do this at home with a Pi, it was a fun project.