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The zero-copy forwarding or the mux-to-mux forwarding is a way to fast-forward data without using the channels buffers. Data are transferred from a mux to the other one. The kernel splicing is an optimization of the zero-copy forwarding. But it can also use normal buffers (but not channels ones). This way, it could be possible to fast-forward data with muxes not supporting the kernel splicing (H2 and H3 muxes) but also with applets. However, this mode can introduce regressions or bugs in future (just like the kernel splicing). Thus, It could be usefull to disable this optim. To do so, in configuration, the global tune settting 'tune.disable-zero-copy-forwarding' may be set in a global section or the '-dZ' command line parameter may be used to start HAProxy. Of course, this also disables the kernel splicing. |
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