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Sharding by-group is exactly identical to by-process for a single group, and will use the same number of file descriptors for more than one group, while significantly lowering the kernel's locking overhead. Now that all special listeners (cli, peers) are properly handled, and that support for SO_REUSEPORT is detected at runtime per protocol, there should be no more reason for now switching to by-group by default. That's what this patch does. It does only this and nothing else so that it's easy to revert, should any issue be raised. Testing on an AMD EPYC 74F3 featuring 24 cores and 48 threads distributed into 8 core complexes of 3 cores each, shows that configuring 8 groups (one per CCX) is sufficient to simply double the forwarded connection rate from 112k to 214k/s, reducing kernel locking from 71 to 55%.
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)