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QUIC emission can use GSO to emit multiple datagrams with a single syscall invokation. However, this feature relies on several kernel parameters which are checked on haproxy process startup. Even if these checks report no issue, GSO may still be unable due to the underlying network adapter underneath. Thus, if a EIO occured on sendmsg() with GSO, listener is flagged to mark GSO as unsupported. This allows every other QUIC connections to share the status and avoid using GSO when using this listener. Previously, listener flag was checked for every QUIC emission. This was done using an atomic operation to prevent races. Improve this by duplicating GSO unsupported status as the connection level. This is done on qc_new_conn() and also on thread rebinding if a new listener instance is used. The main benefit from this patch is to reduce the dependency between quic_conn and listener instances.
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.