Richard B. Gilbert wrote:
Scott L. Glidden wrote:
Hope you don't mind a top-post...
remote refid st t when poll reach delay offset
jitter
==============================================================================
-time.nist.gov .ACTS. 1 u 87 512 37 70.905 10.262
1.691
-ntp-nasa.arc.na .GPS. 1 u 94 512 377 102.491 10.018
1.620
-time-a.nist.gov .ACTS. 1 u 233 512 377 45.727 2.009
4.349
-time-nw.nist.go .ACTS. 1 u 320 512 377 87.205 13.117
0.393
-clock.isc.org .GPSi. 1 u 264 512 377 107.590 14.738
1.249
*ntp1.twc.weathe .CDMA. 1 u 334 512 377 34.050 5.457
1.018
-ntp2.twc.weathe .CDMA. 1 u 262 512 377 34.031 6.166
1.212
-ns1.usg.edu 130.207.244.240 2 u 244 512 377 26.068 7.831
1.776
+ns2.usg.edu .GPS. 1 u 346 512 377 31.300 4.523
0.957
ns3.usg.edu 65.212.71.102 2 u 255 512 377 26.609 7.583
1.248
-ns4.usg.edu 130.207.244.240 2 u 233 512 377 31.934 6.318
3.012
-caesar.cs.wisc. 128.105.201.11 2 u 332 512 377 42.701 8.937
0.746
now.cis.okstate .STEP. 16 u 12h 1024 0 0.000 0.000
0.000
-ntp2.usno.navy. .USNO. 1 u 213 512 377 54.995 2.985
4.446
+tock.usno.navy. .USNO. 1 u 218 512 377 56.119 4.484
0.885
-elastic.org 204.152.184.72 2 u 231 512 377 116.555 6.842
0.172
-216.106.191.180 192.5.41.41 2 u 241 512 377 69.417 7.609
1.177
-ns1.it2.net 204.123.2.72 2 u 317 512 377 89.060 9.447
1.447
-opium.apexvoice 138.23.180.126 3 u 333 512 377 89.006 9.750
1.280
What does the output of an "ntpq -p" show?
David
Lose all the servers with delays greater than 40 milliseconds. The
error in transmitting time from server to client is bounded by one half
the round trip delay; it may be better but it can't get worse than that.
Seven servers should be sufficient for the utmost in reliability. Ten
is the maximum that ntpd will include in the "selection set"
And yet the server with the best jitter is also the one with the
largest delay. And it shows an offset that is right in line with
a group of servers that is below 40 in delay.
Not to muddy the waters, but the shortest delay may tend to be
a better choice, but not always.
--
blu
Rose are #FF0000, Violets are #0000FF. All my base are belong to you.
----------------------------------------------------------------------
Brian Utterback - OP/N1 RPE, Sun Microsystems, Inc.
Ph:877-259-7345, Em:brian.utterback-at-ess-you-enn-dot-kom
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