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

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

On Thu, Mar 10, 2022 at 09:47:21PM +0100, Andre Puschmann wrote:

> > We found that ptp4l can only synchronize NIC clocks (e.g. i210) to an accuracy of ~2µs due to the latency PCIe transactions. If you want better synchronization, ptp4l with off-the-shelf NICs is not a solution.

FUD

For PCIe MACs, their PTP synchronization performance is NOT affected by PCIe latency.

> Interesting. For my application (telecom) I definitely need accuracy in the
> range of 1.5us.

Easy to get the i210 to within a few dozen nanoseconds without doing
anything special.

Thanks,
Richard