Re: [chrony-dev] handling of unstable sources

[Frank Muzzulini <frank.muzzulini@xxxxxxxxxxxx>]

Miroslav Lichvar wrote:
> Interesting. Maybe the 1ms resolution is causing chrony to think it's
> following the source very well for short intervals. The statistics and
> measurements logs would help.

I repeated the test, so here you are. I also included tracking and 
/var/log/messages (timestamps there are UTC+2)

At first chronyd synchronised to 10.10.9.13 and from 11:33:35 to 
11:36:15 it was very well synchronised to that one. Then in 11:36:17 it 
suddenly chosed to prefer 10.10.9.14 and only choosed 10.10.9.13 once 
again afterwards.

Regards,
Frank

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Attachment: measurements.log
Description: application/html

Jul 12 13:31:57 muzzulini chronyd[32296]: chronyd version 1.24 starting
Jul 12 13:31:57 muzzulini chronyd[32296]: Initial txc.tick=9999 txc.freq=1413104 (21.56225586) txc.offset=0 => hz=100 shift_hz=7
Jul 12 13:31:57 muzzulini chronyd[32296]: set_config_hz=0 hz=100 shift_hz=7 basic_freq_scale=1.28000000 nominal_tick=10000 slew_delta_tick=833 max_tick_bias=1000
Jul 12 13:31:57 muzzulini chronyd[32296]: Linux kernel major=2 minor=6 patch=25
Jul 12 13:31:57 muzzulini chronyd[32296]: calculated_freq_scale=0.99902439 freq_scale=0.99902439
Jul 12 13:31:57 muzzulini chronyd[32296]: System's initial offset : 0.000346 seconds fast of true (slew)
Jul 12 13:33:03 muzzulini chronyd[32296]: Selected source 10.10.9.13
Jul 12 13:34:09 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 13:34:39 muzzulini chronyd[32296]: Selected source 10.10.9.13
Jul 12 13:35:13 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 13:36:17 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 13:37:21 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 13:52:18 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 13:53:54 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 13:54:24 muzzulini chronyd[32296]: Selected source 10.10.9.13
Jul 12 13:55:30 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 14:15:14 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 14:16:50 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 14:17:22 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 14:17:54 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 14:34:58 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 14:38:10 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 14:39:46 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 14:40:18 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 14:40:50 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 14:41:22 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 14:56:50 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 14:58:58 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 14:59:30 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 15:00:02 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 15:01:06 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 15:01:38 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 15:19:14 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 15:20:50 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 15:41:06 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 15:43:46 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 15:44:16 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 15:44:18 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 15:45:22 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 15:45:54 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 16:01:54 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 16:04:02 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 16:05:36 muzzulini chronyd[32296]: Selected source 10.10.9.14
Jul 12 16:05:38 muzzulini chronyd[32296]: Can't synchronise: no majority
Jul 12 16:19:12 muzzulini chronyd[32296]: chronyd exiting on signal

Attachment: statistics.log
Description: application/html

Attachment: tracking.log
Description: application/html