[ntp:questions] How to measure the quality of NTP server

Natalie Abravanel natalie.abravanel at kaminario.com
Tue Feb 16 13:54:49 UTC 2016


Before synching to a server, I would like to define some criteria for a good NTP source.
If I query ntp server:

ntpq> associations

ind assid status  conf reach auth condition  last_event cnt
  1 36430  961a   yes   yes  none  sys.peer    sys_peer  1
ntpq> rv
associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer,
version="ntpd 4.2.6p5 at 1.2349-o Mon Jan 25 14:08:27 UTC 2016 (1)",
processor="x86_64", system="Linux/2.6.32-431.el6.x86_64", leap=00,
stratum=3, precision=-24, rootdelay=183.660, rootdisp=63.268,
reftime=da6da105.8ad1ef23  Tue, Feb 16 2016 15:22:13.542,
clock=da6da4db.d53c285b  Tue, Feb 16 2016 15:38:35.832, peer=36430,
tc=10, mintc=3, offset=0.584, frequency=-17.995, sys_jitter=0.000,
clk_jitter=0.472, clk_wander=0.106

*         What should be decent values for : precision, rootdelay, rootdisp, frequency, sys_jitter, clk_jitter, clk_wander?
I don't want to start syncing with in accurate source (and I have limitations to sync only to one server, which usually as I understand is less recomanded)
I am trying to find some benchmarks for a good quality ntp server.

*         The association rv=0, is it reflect the system clock? (I am a bit confused...) I know that other associations if exist reflect the state to a specific refid

Appreciate any help,
10x, Natalie

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