Clock synchronization with Chris Perl
Signals and Threads
How to Make PTP More Accurate Than NTP
The idea is that you can do in some sense the moral equivalent of what NTP does with like the two middle timestamps. And so delays and noise are introduced by, for example, queuing on the switch would go away. Some cards these days support the ability to hardware timestamp all the packets. If your machine is just acting as an NTP server and most of the packets it receives are NTP packets, then you're effectively time stamping NTP packets.
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