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c7bd7a68e4
It's inefficient and counter-productive that each ring writer iterates over all readers to wake them up. Let's just have one in charge of this, it strongly limits contention. The only thing is that since the thread is iterating over a list, we want to be sure that if the first readers have already completed their job, they will be woken up again. For this we keep a counter of messages delivered after the wakeup started, and the waking thread will check it before going back to sleep. In order to avoid looping forever, it will also drop its waking flag soon enough to possibly let another one take it. There used to be a few cases of watchdogs before this on a 24-core AMD EPYC platform on the list iteration those never appeared anymore. The perf has dropped a bit on 3C6T on the EPYC, from 6.61 to 6.0M but remains unchanged at 24C48T. |
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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)