Hi > On Jun 15, 2015, at 9:38 PM, Chris Caudle <[email protected]> wrote: > > On Mon, June 15, 2015 8:01 pm, Bob Camp wrote: >> Unless you have fancy switches on your LAN (1588 stamping), PTP >> performance will be dependent on load and the "goodness" of the switches > you do >> have. These are pretty much the same (external) things that impact NTP. > > Yes, but proper differentiated services setup with multiple queues can > help mitigate that to a large extent. I'm still trying to get my PTP > setup going, so I don't have any measurements of my own yet, but there are > lots of examples of large commercial systems in use without transparent > clock support which can maintain sub-microsecond synchronization. Using > PTP transparent switches should get down into the couple hundred > nanosecond range or better, but even without 800 or so nanoseconds has > been shown to be consistently possible. > I have no idea what level of synchronization you could keep using just NTP > with diffserv.
I believe that you can do exactly that. Once you take the stamping switches out of the mix there isn’t a lot of difference between the two protocols. You would indeed need to tweak NTP a bit, but that part of the fun. Bob > That might be an interesting experiment to try for those > who only want NTP and aren't interested in setting up PTP. > > -- > Chris Caudle > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
