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One limitation of the current thread index mechanism is that if the values are assigned multiple times to the same thread and the index loops, it can match again the old value, which will not prevent a competing thread from finishing its CAS and assigning traffic to a thread that's not the optimal one. The probability is low but the solution is simple enough and consists in implementing an update counter in the high bits of the index to force a mismatch in this case (assuming we don't try to cover for extremely unlikely cases where the update counter loops while the index remains equal). So let's do that. In order to improve the situation a little bit, we now set the index to a ulong so that in 32 bits we have 8 bits of counter and in 64 bits we have 40 bits.
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 - BRANCHES to understand the project's life cycle and what version to use - 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)