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ntp: randomize replacement interval

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Replacement attempts are globally rate limited to one per 7*2^8 seconds
to limit the rate of DNS requests for public servers like pool.ntp.org.
If multiple sources are repeatedly attempting replacement (at their
polling intervals), one source can be getting all attempts for periods
of time.

Use a randomly generated interval to randomize the order of source
replacements without changing the average rate.
This commit is contained in:
Miroslav Lichvar
2023-06-06 12:02:53 +02:00
parent ab8da7ecb9
commit b90d2c084f
2 changed files with 10 additions and 7 deletions
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4
test/simulation/139-nts
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@@ -160,8 +160,8 @@ for dns in 1 0; do
check_file_messages " 2 1 .* 4460 " 50 100 log.packets || test_fail
check_file_messages " 2 2 .* 4460 " 0 0 log.packets || test_fail
check_log_messages "Source 192.168.123.1 changed to 192.168.123.2" 6 8 || test_fail
check_log_messages "Source 192.168.123.2 replaced with 192.168.123.1" 6 8 || test_fail
check_log_messages "Source 192.168.123.1 changed to 192.168.123.2" 4 10 || test_fail
check_log_messages "Source 192.168.123.2 replaced with 192.168.123.1" 4 10 || test_fail
servers=2