Hans =?iso-8859-1?Q?J=F8rgen?= Jakobsen <h...@wheel.dk> writes: >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. Same network cards. Just different switches between the computers. >/hjj >> >> _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
