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Tasks allowed to run on multiple threads, as well as those scheduled by one thread to run on another one pass through the global queue. The local queues only see tasks scheduled by one thread to run on itself. The tasks extracted from the global queue are transferred to the local queue when they're picked by one thread. This causes a priority issue because the global tasks experience a priority contest twice while the local ones experience it only once. Thus if a tasks returns still running, it's immediately reinserted into the local run queue and runs much faster than the ones coming from the global queue. Till 1.9 the tasks going through the global queue were mostly : - health checks initialization - queue management - listener dequeue/requeue These ones are moderately sensitive to unfairness so it was not that big an issue. Since 2.0-dev2 with the multi-queue accept, tasks are scheduled to remote threads on most accept() and it becomes fairly visible under load that the accept slows down, even for the CLI. This patch remedies this by consulting both the local and the global run queues in parallel and by always picking the task whose deadline is the earliest. This guarantees to maintain an excellent fairness between the two queues and removes the cascade effect experienced by the global tasks. Now the CLI always continues to respond quickly even in presence of expensive tasks running for a long time. This patch may possibly be backported to 1.9 if some scheduling issues are reported but at this time it doesn't seem necessary. |
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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 - 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)