Has anybody used PTP time stamp hardware with NTP?

[Hal Murray]

That should lead to better (earlier) time stamps.  It will bypass the 
interrupt response time and the coalesce delays.

As I understand it, the catch is that the clock out near the network is not 
directly connected to the CPU clock so the time stamps from the hardware need 
to be translated to system time.

I'm looking for a HOWTO type recipe for setting things up.

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