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The presend option in interleaved mode uses two presend requests instead of one to get an interleaved response from servers like chrony which delay the first interleaved response due to an optimization saving timestamps only for clients actually using the interleaved mode. After commit0ae6f2485b("ntp: don't use first response in interleaved mode") the first interleaved response following the two presend responses in basic mode is dropped as the preferred set of timestamps minimizing error in delay was already used by the second sample in basic mode. There are only three responses in the burst and no sample is accumulated. Increasing the number of presend requests to three to get a fourth sample would be wasteful. Instead, allow reusing timestamps of the second presend sample in basic mode, which is never accumulated. Reported-by: Aaron Thompson Fixes:0ae6f2485b("ntp: don't use first response in interleaved mode")
This is a collection of simulation tests using the clknetsim simulator (supported on Linux only). https://github.com/mlichvar/clknetsim The CLKNETSIM_PATH environment variable should point to the directory where clknetsim was downloaded and compiled. If the variable is not set, the tests will look for clknetsim in ./clknetsim in the current directory. The tests are written in bash and they can be run directly. The ./run script runs all tests.