253fba01a7
Along many tests involving both haproxy's scheduler and forwarded traffic, various exponents and algorithms were attempted for the EBO and their effects were measured. It was found that a growth in 1.25^N limited to 128k cycles consistently gives a better latency than 1.5^N limited to 256k cycles, without degrading general performance. The measures of the time to grab a write lock on a 48-thread EPYC show that the number of occurrences of low times was roughly multiplied by 2-3 while the number of occurrences of times above 64us was reduced by similar factors, to even reach 300 at 64us and limiting the maximum time by a factor of 4. The other variants that were experimented with are: m = ((m + (m >> 1)) + 2) & 0x3ffff; // original m = ((m + (m >> 1) + (m >> 3)) + 2) & 0x3ffff; m = ((m + (m >> 1) + (m >> 4)) + 2) & 0x3ffff; m = ((m + (m >> 1) + (m >> 4)) + 2) & 0x1ffff; m = ((m + (m >> 1) + (m >> 4)) + 1) & 0x1ffff; m = ((m + (m >> 2) + (m >> 4)) + 1) & 0x1ffff; // lowest CPU on pl_wr test + good perf m = ((m + (m >> 2)) + 1) & 0x1ffff; // even lower cpu usage, lowest max m = ((m + (m >> 1) + (m >> 2)) + 1) & 0x1ffff; // correct but slightly higher maxes m = ((m + (m >> 1) + (m >> 3)) + 1) & 0x1ffff; // less good than m+m>>2 m = ((m + (m >> 2) + (m >> 3)) + 1) & 0x1ffff; // better but not as good as m+m>>2 m = ((m + (m >> 3) + (m >> 4)) + 1) & 0x1ffff; // less good, lower rates on small coounts. m = ((m + (m >> 2) + (m >> 3) + (m >> 4)) + 1) & 0x1ffff; // less good as well m = ((m & 0x7fff) + (m >> 1) + (m >> 4)) + 2; m = ((m & 0xffff) + (m >> 1) + (m >> 4)) + 2; This is plock commit dddd9ee01c522da33c353e2e4d4fd743d8336ec3.
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.