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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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2
test/simulation/110-chronyc
View File

@@ -102,7 +102,7 @@ limit=1
for chronyc_conf in \
"accheck 1.2.3.4" \
"add peer 10.0.0.0 minpoll 2 maxpoll 6" \
"add server 10.0.0.0 minpoll 6 maxpoll 10 iburst burst key 1 certset 2 maxdelay 1e-3 maxdelayratio 10.0 maxdelaydevratio 10.0 mindelay 1e-4 asymmetry 0.5 offset 1e-5 minsamples 6 maxsamples 6 filter 3 offline auto_offline prefer noselect trust require xleave polltarget 20 port 123 presend 7 minstratum 3 version 4 nts ntsport 4460 copy extfield F323" \
"add server 10.0.0.0 minpoll 6 maxpoll 10 iburst burst key 1 certset 2 maxdelay 1e-3 maxdelayratio 10.0 maxdelaydevratio 10.0 maxdelayquant 0.5 mindelay 1e-4 asymmetry 0.5 offset 1e-5 minsamples 6 maxsamples 6 filter 3 offline auto_offline prefer noselect trust require xleave polltarget 20 port 123 presend 7 minstratum 3 version 4 nts ntsport 4460 copy extfield F323" \
"add server node1.net1.clk" \
"allow 1.2.3.4" \
"allow 1.2" \

14
test/simulation/118-maxdelay
View File

@@ -25,4 +25,18 @@ for client_server_options in "maxpoll 6 maxdelay 2e-5"; do
check_sync && test_fail
done
min_sync_time=10
client_conf="
logdir tmp
log rawmeasurements"
client_server_options="minpoll 2 maxpoll 2 maxdelayquant 0.1"
run_test || test_fail
check_chronyd_exit || test_fail
check_packet_interval || test_fail
check_sync || test_fail
check_file_messages "20.*123\.1.* 111 111 1111" 200 500 measurements.log || test_fail
check_file_messages "20.*123\.1.* 111 111 1101" 2000 2300 measurements.log || test_fail
test_pass