Re: [Linuxptp-users] Building a PTP grandmaster with disciplined oscillator

[Richard C. <ric...@gm...>]

On Fri, Mar 11, 2022 at 06:30:49AM -0800, Axel Simon wrote:

> Sorry, I checked again and I stand corrected. We saw some offsets
> before we were able to monitor our system properly and it's still in
> my head that we can't get better than 2µs of noise. We are
> synchronizing the PTP clocks between different NICs using phc2sys
> and connect two x86 systems.

Right, using phc2sys is not a great design for a GM.

Why?

because it uses SW time stamping.

But that is not the fault of the i210 card.

If you were to feed a 1 PPS from a GPS radio into the SDP of the i210,
for example, then you get your time error well below 1 usec.

Thanks,
Richard