On Tue, Mar 08, 2022 at 04:17:29PM +0100, Martin Pecka wrote:
> Or is there another way (except watching the master offset via pmc and
> trying to re-do the same algorithm that manages the servo state inside
> ptp4l?).

Use the NSM for more accurate monitoring:

NAME
       nsm - NetSync Monitor client

SYNOPSIS
       nsm [ -f config ] [ -i interface ] [ long-options ] [ command ] ...

DESCRIPTION
       nsm  is  a program which implements a NetSync Monitor (NSM) client. NSM
       is an extension to the Precision Time Protocol (PTP), which  enables  a
       client  to measure the offset of its clock against any PTP clock in the
       network which supports NSM. It uses unicast messages, but unlike PTP in
       the  unicast mode it does not require the server to keep any state spe‐
       cific to the client. It is particularly useful for monitoring.

Thanks,
Richard


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