Having been testing ntp, I was looking at the peerstats file. Here is a sequence of such measurements.
54489 29187.448 137.82.1.3 9414 0.005089025 0.016225398 0.067088246 0.001122070 54489 29269.446 142.103.234.11 9614 0.003231929 0.015419416 0.009606450 0.001005171 54489 29316.445 137.82.1.3 9414 0.005089025 0.016225398 0.067796410 0.000929591 54489 29396.445 142.103.234.11 9614 0.002083530 0.015706261 0.007395887 0.000386142 54489 29443.447 137.82.1.3 9414 0.005089025 0.016225398 0.067421760 0.001041993 54489 29523.443 142.103.234.11 9614 0.002083530 0.015706261 0.009098914 0.000252795 I thought that there was an entry in this file for each packet exchange with the server. But notice the entries at 29396.445 and 29523.443 seconds. The offsets are completely identical. There is no way that this could be true if this were really the outcome of a measurement. There is just no way that you would get two entries the same to 7 decimal places ( well, it is really only 4 since the machines have a resolution of a microsecond). And there are a number of these. This simply cannot be the offset as obtained from a measurement. What do these entries mean? How can the two offsets be identical? Note that I was watching successive output from ntpq -p at the same time. and the "when" entry went from 122 to 34-- ie indicated that a measurement was made-- and the offset did not change at all. Just before this in the peerstats file there were 7 entries with identical offsets and identical roudtrip delays. What is happening here? What does the "offset" and "roundtrip delay" mean if not the measured offset (t4-t3+t1-t2)/2 and roundtrip (t4-t1) on each measurement? _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
