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This case does not exist yet with the H1 multiplexer, but applets may decide to not produce data if there is not enough room in the destination buffer (the applet's outbuf or the opposite SE buffer). It is true for the stats applets for instance. However this case is not properly handled when the zero-copy forwarding is in-use. To fix the issue, the se_done_ff() function was modified to return the number of bytes really forwarded and to subs for sends if nothing was forwarded while the zero-copy forwarding was blocked by the producer. On the applet side, we take care to block the zero-copy forwarding if the applet requests more room. At the end, zero-copy forwarding is unblocked if something was forwarded. This way, it is now possible for the stats applet to report a full buffer and block the zero-copy forwarding, even if the buffer is not really full, by requesting more room. No backport needed.
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)