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ntp: add maxdelayquant option

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Add a new test for maximum delay using a long-term estimate of a
p-quantile of the peer delay. If enabled, it replaces the
maxdelaydevratio test. It's main advantage is that it is not sensitive
to outliers corrupting the minimum delay.

As it can take a large number of samples for the estimate to reach the
expected value and adapt to a new value after a network change, the
option is recommended only for local networks with very short polling
intervals.
This commit is contained in:
Miroslav Lichvar
2022-07-21 15:16:47 +02:00
parent 851c823b42
commit 070b4f69d0
12 changed files with 94 additions and 10 deletions
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doc/chronyc.adoc
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@@ -699,7 +699,8 @@ packets sent to the source is more variable than the delay of packets sent
from the source back.
*NTP tests*:::
Results of RFC 5905 tests 1 through 3, 5 through 7, and tests for maximum
delay, delay ratio, delay dev ratio, and synchronisation loop.
delay, delay ratio, delay dev ratio (or delay quantile), and synchronisation
loop.
*Interleaved*:::
This shows if the response was in the interleaved mode.
*Authenticated*:::