[ntp:questions] Client doesn't drop failed source
david at ex.djwhome.demon.invalid
Wed Jan 20 08:04:29 UTC 2010
David Mills wrote:
> Not true. The dispersion does increase, but the server is valid until
> the dispersion exceeds the select threshold, usually in four or five
> more missed messages.
That's why I said the quality measures are invalidated, rather than the
server is invalidated. I probably should have said "effectively". I
guess that anti-clock hopping may reduce the effect.
I was really trying to correct my initial reading, that the only
reachability check was reachability == 0. There is also a reachability
& 7 == 0 check, earlier in the code, which results in a sample with the
maximum possible dispersion value being loaded.
I can't tell, quickly, what gets loaded when there are only one or two
missed polls. I'd always assumed that the filter slots tracked the
rachability ones, but maybe not.
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