Hi I probably should have added that I already know that the switch will do sub 1 ms LAN pings all day long with the near zero load that it’s running. Sorry about that.
Now, there certainly are OS level things on my laptop that will muck up pings. Unfortunately they also get into a number of timing things as well. Bob > On Jan 13, 2017, at 1:08 PM, Denny Page <[email protected]> wrote: > >> On Jan 13, 2017, at 09:40, Bob Camp <[email protected]> wrote: >> >> Just for reference, I happen to be running a ping over my local WiFi to one >> of the switches >> on the LAN. The ping response is anywhere from 2 ms out to 400 ms. Most of >> the time it’s >> in the 3 to 9 ms range. Simply taking that down to < 1 us would be a really >> big deal. > > > Ping, particularly to a switch, is not a good indication of actual latency in > a local network. Hosts do not prioritize responding to icmp, and on a switch > to icmp is the lowest “I’ll get around to it” priority the switch has. > Pinging the switch that my host is directly attached to gives an average of > 1.22ms. Pinging another host attached to the same switch gives an average of > 100us. The actual port to port latency on the switch is 2.45us. Your mileage > may vary. > > Denny > > _______________________________________________ > 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.
