Re: [chrony-users] Multi-source: No source change from unreachable to reachable one

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On Thu, Oct 10, 2019 at 01:53:03PM +0000, Joanna Yurdal wrote:
> chrony.conf:
> refclock SHM 0 poll 2 dpoll 0 refid PTP0 precision 1.0e-9 delay 1.0e-04 prefer
> server iburst minpoll 2
> When SHM source looses reachability, each second both s-> last_sample_ago and max_reach_sample_ago are increased by one 
> The condition never becomes true and the unreachable(invalid) source remains the selected source forever.

No, it shouldn't be selected forever. How long did you wait?

With each sample dropped by the (reachable) NTP source
max_reach_sample_ago should get smaller and at some point the SHM
source should become "stale" and be unselected, if it doesn't happen
earlier due to increased root distance.

> I did not really understand the intention for this a comparison.
> Was it indented to compare newest sample from unreachable source with the newest sample from reachable source instead?

No, it's supposed to compare the newest sample of the unreachable
source with oldest sample of a reachable source to determine if the
spans of the two sources still overlap.

Miroslav Lichvar

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