On Fri, Jan 13, 2017 at 8:45 PM, Chris Albertson <[email protected]> wrote: > Short answer: See man page for ntpq > > Longer... > > First run NTP then after some time (15 minute to an hour) at the command > line time type "ntpq -p" > > "ntpq" will query NTP for timing statistics. It will report the average > delay between the local computer and the set of reference clocks (other > servers) that NTP is connected to. Along with the average delay you get > variation in that delay (std dev?) Note the if NTP can calculate the > delay, it has already compensated for it. It is only the uncertainty of > the compensation that matters, hence the need to report the variation. > > The data shows the total delay and variation over the network and the > reference clocks might be thousands of miles away. So you might want to > run one on say your wifi router or a local computer with hardwire > connection to the router then you'd see the effect of only your wifi. > > > > On Fri, Jan 13, 2017 at 12:35 PM, Bob Camp <[email protected]> wrote: > >> Hi >> >> What standard protocol would you recommend I run from the command line on >> my computer >> to get a quick estimate of the timing lag and variablilty on my >> particular WiFi connection? >> >> Bob >> >> > On Jan 13, 2017, at 3:25 PM, John Hawkinson <[email protected]> wrote: >> > >> > Can we please stop talking about pings? >> > >> > Bob Camp <[email protected]> wrote on Fri, 13 Jan 2017 >> > at 15:12:38 -0500 in <[email protected]>: >> > >> >> I’m sure you are right about the response time. Right now the >> >> variation is running almost 3 ms at one sigma on a ping so there is >> >> a lot to do simply to get the accuracy anywhere near 1 us. >> >
Presuming that the computer on the WiFi network is a supported Unix, I might use PTP to measure one way delay, PTP needs "special" hardware to do hardware timestamping, but _can_ be run on any network interface. I'd guess that the the WiFi for doing "sub microsecond" accuracy would not be the current 2.4ghz and 5ghz, but 802.11ay Cheers Arne _______________________________________________ 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.
