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HAProxy - Load balancer
1efafce61f
There is one point where we can migrate a connection to another thread without taking risk, it's when we accept it : the new FD is not yet in the fd cache and no task was created yet. It's still possible to assign it a different thread than the one which accepted the connection. The only requirement for this is to have one accept queue per thread and their respective processing tasks that have to be woken up each time an entry is added to the queue. This is a multiple-producer, single-consumer model. Entries are added at the queue's tail and the processing task is woken up. The consumer picks entries at the head and processes them in order. The accept queue contains the fd, the source address, and the listener. Each entry of the accept queue was rounded up to 64 bytes (one cache line) to avoid cache aliasing because tests have shown that otherwise performance suffers a lot (5%). A test has shown that it's important to have at least 256 entries for the rings, as at 128 it's still possible to fill them often at high loads on small thread counts. The processing task does almost nothing except calling the listener's accept() function and updating the global session and SSL rate counters just like listener_accept() does on synchronous calls. At this point the accept queue is implemented but not used. |
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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)