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When we're in H1_MSG_RQBEFORE or H1_MSG_RPBEFORE, we know that the first message is highly likely the only one and that it's pointless to try to perform a second recvfrom() to complete a first partial read. This is similar to what used to be done in the older I/O methods with the CF_READ_DONTWAIT flag on the channel. So let's pass CO_RFL_READ_ONCE to the transport layer during rcv_buf() in this case. By doing so, in a test involving keep-alive connections with a non-null client think time, we remove 20% of the recvfrom() calls, all of which used to systematically fail. More precisely, we observe a drop from 5.0 recvfrom() per request with 60% failure to 4.0 per request with 50% failure.
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)