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6c1b29d06f
Now the rings have one wait queue per group. This should limit the contention on systems such as EPYC CPUs where the performance drops dramatically when using more than one CCX. Tests were run with different numbers and it was showed that value 6 outperforms all other ones at 12, 24, 48, 64 and 80 threads on an EPYC, a Xeon and an Ampere CPU. Value 7 sometimes comes close and anything around these values degrades quickly. The value has been left tunable in the global section. This commit only introduces everything needed to set up the queue count so that it's easier to adjust it in the forthcoming patches, but it was initially added after the series, making it harder to compare. It was also shown that trying to group the threads in queues by their thread groups is counter-productive and that it was more efficient to do that by applying a modulo on the thread number. As surprising as it seems, it does have the benefit of well balancing any number of threads. |
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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)