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The plock code hasn't been been updated since 2017 and didn't benefit from the exponential back-off improvements that were added in 2018. Simply updating the file shows a massive performance gain on large thread count (>=48) with dequeuing going from 113k RPS to 300k RPS and round robin from 229k RPS to 1020k RPS. It was about time to update. In addition, some recent improvements to the code will be useful with thread groups. An interesting improvement concerns EPYC CPUs. This one alone increased fairness and was sufficient to avoid crashes in process_srv_queue() there, when hammering two servers with maxconn 200 under 1k connections.
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)