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If an MT-aware poller reports that a file descriptor was migrated, it must stop reporting it. The simplest way to do this is to program an update if not done yet. This will automatically mark the FD for update on next round. Otherwise there's a risk that some events are reported a bit too often and cause extra CPU usage with these pollers. Note that epoll is currently OK regarding this. Select does not need this because it uses a single shared events table, so in case of migration no FD change is expected. This should be backported as far as 2.2.
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)