On Fri, 22 May 2009 23:47:35 GMT, Unruh wrote: > Note also that it can depend on the network harware. When we ran 100Mb/s > switches, the delay time was astonishingly regular and repeatable. Now > that we have switched to Gb switches it is not. It much worse. There > seems to be a one way "quantization" It used to be that the round trip > time from the machines to the ntp stratum 1 source was consistantly > 140-160usec. Now it varies, with one level still at the 140usec, but > other round trip times of 280 or even longer (on the same machine). > And they seem to be one > way delays ( the worst kind). Ie, you really need to select the switches > between your stratum 1 sources and your machines carefully to get the > best behaviour.
There could be interrupt coalescing going on in one or more network cards. /hjj > > _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
