On Mon, May 25, 2020 at 11:46:19PM -0500, Dan Drown wrote: > This adds the "disablerxadjust" config option to hwtimestamp. This uses RX > timestamps at the 1588 point (after SFD/before ethernet header) instead of > the NTP point (after ethernet CRC). At 1G, this changes the timestamp (and > RTT) by 752ns. To be symmetrical, you'd want this enabled on both the NTP > server and client.
What is the use case for this option? Is it meant for testing or debugging? As NTP doesn't rely on HW support in switches/routers, it needs to shift the timestamping point to the end of the packet to minimize the error when the server and client are connected to the network with different link speeds. If you know the link speed, you could use the rxcomp option to make the adjustment manually. If there is a good use case, please try to find a shorter name, update also the documentation, and submit it as a git patch. -- Miroslav Lichvar -- To unsubscribe email [email protected] with "unsubscribe" in the subject. For help email [email protected] with "help" in the subject. Trouble? Email [email protected].
