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This adds new class TL_RT, which is processed before other queues for one (and only one) tasklet featuring the TASK_RT flag. This is meant to process real time wakeups under load with even less latency. We only process one entry to make sure it will not be abused for unimportant stuff, and if tune.sched.low-latency is set, we also avoid picking more tasks from the current run queues and looping after the first call to run_tasks_from_list(). Measurements under a load of 10k concurrent conns injection at 10 Gbps (~58k 20kB objects/s) on 4 threads and with task profiling enabled shows that the average wakeup latency for wakeups every 10ms dropped from 220 microseconds to 1.8 microsecond, and even ~550 nanoseconds when tune.sched.low-latency is set, or 400 times less. The doc was updated, including the schematics. |
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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.