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QUIC streamdesc layer is responsible to handle reception of ACK for streams. It removes stream data from the underlying buffers on ACK reception. Streamdesc layer treats ACK in order at the stream level. Out of order ACKs are buffered in a tree until they can be handled on older data acknowledgement reception. Previously, qf_stream instance which comes from the quic_tx_packet was used as tree node to buffer such ranges. Introduce a new type dedicated to represent out of order stream ack data range. This type is named qc_stream_ack. It contains minimal infos only relative to the acknowledged stream data range. This allows to reduce size of frequently used quic_frame with the removal of tree node from qf_stream. Another side effect of this change is that now quic_frame are always released immediately on ACK reception, both in-order and out-of-order. This allows to also release the quic_tx_packet instance which should reduce memory consumption. The drawback of this change is that qc_stream_ack instance must be allocated on out-of-order ACK reception. As such, qc_stream_desc_ack() may fail if an error happens on allocation. For the moment, such error is silenly recovered up to qc_treat_rx_pkts() with the dropping of the received packet containing the ACK frame. In the future, it may be useful to close the connection as this error may only happens on low memory usage.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
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)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.