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Gcc 10.2 implements outline atomics on aarch64. The replace all inline atomic ops with a function call that checks if the machine supports LSE atomics. This comes with a small cost but allows modern machines to scale much better than with the old LL/SC ones even when built for full 8.0 compatibility. This patch enables the use of the __atomic_compare_exchange() builtin for the double-word CAS when detected as available instead of using the hand-written LL/SC version. The extra cost is negligible because we do very few DWCAS operations (essentially FD migrations and shared pools) so the cost is low but under high contention it can still be beneficial. As expected no performance difference was measured in either direction on 4-core machines with this change. This could be backported to 2.3 if it was shown that FD migrations were representing a significant source of contention, but for now it does not appear to be needed.
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)