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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] Update interval larger than maxpoll
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Mon, 29 Apr 2024 09:24:41 +0200
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On Sun, Apr 28, 2024 at 09:40:27AM +0000, Henning Svane wrote:
> 2 questions
> The green line: Is it correct that the time is only 0,03ms off from the reference time.
We don't know that. The root delay and dispersion are in
milliseconds. You would need a much more accurate time source (e.g.
reference clock or close stratum 1 server) to be able to measure the
error of the clock in microseconds.
> The red line I cannot understand why I get and update period over 128s.
That might be due to measurements failing some NTP tests. Check
ntpdata or the measurements log. See also this answer to a similar
question:
https://chrony-project.org/faq.html#_does_selected_source_drop_new_measurements
> From the config file.
> server mmo1.nts.netnod.se nts iburst minpoll 6 maxpoll 7
>
> odin@swntp01:/var/log/zabbix$ chronyc tracking
> Reference ID : C23ACCC4 (mmo1-ts.nts.netnod.se)
> Stratum : 2
> Ref time (UTC) : Sat Apr 27 09:46:46 2024
> System time : 0.000013121 seconds slow of NTP time
> Last offset : -0.000007295 seconds
> RMS offset : 0.000003989 seconds
> Frequency : 51.591 ppm fast
> Residual freq : -0.000 ppm
> Skew : 0.010 ppm
> Root delay : 0.002788649 seconds
> Root dispersion : 0.005857296 seconds
> Update interval : 8004.5 seconds
> Leap status : Normal
>
> Regards
> Henning-
--
Miroslav Lichvar
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