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The server lock was taken preventively for anything in health_adjust(), including the static config checks needed to detect that the lock was not needed, while the function is always called on the response path to update a server's status. This was responsible for huge contention causing a performance drop of about 17% on 16 threads. Let's move the lock only where it should be, i.e. inside the function around the critical sections only. By doing this, a 16-thread process jumped back from 575 to 675 krps. This should be backported to 2.3 as the situation degraded there, and maybe later to 2.2.
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)