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Zero-copy fast-forwading feature is a quite new and is a bit sensitive. There is an option to disable it globally. However, all protocols have not the same maturity. For instance, for the PT multiplexer, there is nothing really new. The zero-copy fast-forwading is only another name for the kernel splicing. However, for the QUIC/H3, it is pretty new, not really optimized and it will evolved. And soon, the support will be added for the cache applet. In this context, it is usefull to be able to enable/disable zero-copy fast-forwading per-protocol and applet. And when it is applicable, on sends or receives separately. So, instead of having one flag to disable it globally, there is now a dedicated bitfield, global.tune.no_zero_copy_fwd.
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)