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The idea is to redistribute an incoming connection to one of the threads a bind_conf is bound to when there is more than one. We do this using a random improved by the p2c algorithm : a random() call returns two different thread numbers. We then compare their respective connection count and the length of their accept queues, and pick the least loaded one. We even use this deferred accept mechanism if the target thread ends up being the local thread, because this maintains fairness between all connections and tests show that it's about 1% faster this way, likely due to cache locality. If the target thread's accept queue is full, the connection is accepted synchronously by the current thread.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)