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There is still an issue with zero-copy forwarding of chunks with an unknown size. It is possible for a producer to fill the sapce reserved for the CRLF at the end of the chunk. The root cause is that this space is not accounted in the iobuf offset. So, from the producer point of view, the space may be used. We can also argue the current design for iobuf is not well suited for this case. Instead of using a pointer on the consumer's buffer, it could be easier to use a custom buffer built on top of the consumer one, via a call to b_make(), with the size, head and data field reflecting the avaialble space the producer can use. By the way, because of this bug, it is possible to trigger a BUG_ON() when we try to write the CRLF at the end of the chunk because the buffer is full. It is unexpected. Only the stats applet may hit this bug. To fix the issue, instead of writting this CRLF when the current chunk is consumed, it is written before consuming the next one. This way, all space reserved to create the chunk formatting is always placed before forwarding data. 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)