871c80505c
In https://bugs.gentoo.org/964719, Dan Goodliffe reported that using CFLAGS="-O3 -march=westmere" creates a binary that segfaults on startup with gcc-15. This could be reproduced here, is isolated to gcc-15 and -O3, and is caused by gcc emitting "movdqa" instructions to read unaligned longs taken from chars that were carefully isolated within ifdefs checking for support for unaligned integers on the platform... Some experiments showed that changing all casts all over the code using either typedef-enforced align(1) or using the packed union trick does the job, it needs a more in-depth validation since it's obvious that it doesn't produce the same code at all (at least on more modern machines). However, the offending optimization option could be isolated, it's "-fvect-cost-model=dynamic" which causes this, while -O2 uses "-fvect-cost-model=very-cheap". Turning it back to very-cheap solves the issue, reduces the code, and yields an extra 5% performance increase on the http-request rate (181k vs 172k on a single core)! This could at least partially explain why it has been observed several times over the last few years that -O3 yields bigger and slower code than -O2. It was also verified that the option doesn't change the emitted code at -O0..-O2,-Os,-Oz, but only at -O3. This patch detects the presence of this option and turns it on to address the problem that some distros are facing after an upgrade to gcc-15. As such it should be backported to recent LTS and stable branches. Here, 3.1 was used, so it seems legit to at least target the last two LTS branches (i.e. go as far as 3.0). Thanks to Dan Goodliffe for sharing a working reproducer, Sam James for starting the investigations and Christian Ruppert for bringing the issue to us.
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.