8098be1fdc
Pacing algorithm has been revamped in the previous commit to implement a credit based solution. This is a far more adaptative solution, in particular which allow to catch up in case pause between pacing emission was longer than expected. This allows QMUX to remove the active loop based on tasklet wake-up. Instead, a new task is used when emission should be paced. The main advantage is that CPU usage is drastically reduced. New pacing task timer is reset each time qcc_io_send() is invoked. Timer will be set only if pacing engine reports that emission must be interrupted. In this case timer is set via qcc_wakeup_pacing() to the delay reported by congestion algorithm, or 1ms if delay is too short. At the end of qcc_io_cb(), pacing task is queued if timer has been set. Pacing task execution is simple enough : it immediately wakes up QCC I/O handler. Note that to have decent performance, it requires to have a large enough burst defined in configuration of quic-cc-algo. However, this value is common to every listener clients, which may cause too much loss under network conditions. This will be address in a future patch. This should be backported up to 3.1.
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.