[EMAIL PROTECTED] (Hal Murray) writes:
>>Yes, PTP can yield an accuracy better than 100 ns if both the NICs at the >>clients and the server support hardware timestamping of sent/received PTP >>packets. >> >>On the other hand, also *every* network node between the PTP endpoints has >>to be PTP-aware and compensate the packet delay it introduces, so you will >>probably only get full PTP accuracy in your local network where you have >>control over all the equipment. >Suppose I have PTP network adapters but vanilla switches and my >network is lightly loaded. >Can I filter out the delays in the switches by sending 10 packets >and throwing out the ones with long delays? I'd expect the >timings to be a cluster around the case where there was no delay >in the switch and a tail for the ones that encountered some >delay. I think it would be easy to filter out that tail. ntp already does. It throws away 85% of the packets it gets, keeping only the roughly 1/8 of them with the shortest round trip times (a real waste of data I think but it certainly solves your problem). _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
