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HAProxy - Load balancer
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Willy Tarreau 6c69d6b2b1 MINOR: debug: add "rt=1" to "debug dev task" to tune the RT flag 
When rt=1 is set, the created task is set to real time. This will
essentially be used jointly with print=1 to print the wakeup date.

Now it is pretty much visible that TASK_RT helps keeping recurrent
delays stable under load:

  $ socat - /tmp/sock1 <<< "expert-mode on;debug dev sched task inter=1 count=100000"
  $ socat - /tmp/sock1 <<< "expert-mode on;debug dev sched task print=1 inter=1000 count=1"

  $ taskset -c 0  ./haproxy -db -f h2-h1.cfg
  [NOTICE]   (11262) : Automatically setting global.maxconn to 2033.
  task 0x5a67740: time_ms=355817139.2593
  task 0x5a67740: time_ms=355818165.934056
  task 0x5a67740: time_ms=355819192.609666
  task 0x5a67740: time_ms=355820219.528467
  task 0x5a67740: time_ms=355821245.778249
  task 0x5a67740: time_ms=355822271.800731
  task 0x5a67740: time_ms=355823297.836419
  task 0x5a67740: time_ms=355824327.894992
  task 0x5a67740: time_ms=355825354.92738
  task 0x5a67740: time_ms=355826381.242925
  ^C
  => ~1030ms interval

  $ socat - /tmp/sock1 <<< "expert-mode on;debug dev sched task inter=1 count=100000"
  $ socat - /tmp/sock1 <<< "expert-mode on;debug dev sched task print=1 inter=1000 count=1 rt=1"

  $ taskset -c 0  ./haproxy -db -f h2-h1.cfg
  [NOTICE]   (11274) : Automatically setting global.maxconn to 2033.
  task 0x1c89d740: time_ms=355842657.804670
  task 0x1c89d740: time_ms=355843657.130495
  task 0x1c89d740: time_ms=355844657.159396
  task 0x1c89d740: time_ms=355845657.176695
  task 0x1c89d740: time_ms=355846657.144914
  task 0x1c89d740: time_ms=355847657.416217
  task 0x1c89d740: time_ms=355848657.192072
  ^C
  => ~1000ms interval

Also mixing one non-rt and one rt tasks easily shows that the non-RT skews:

  task 0x3180080: time_ms=356074147.738657
  task 0x7f82705749c0: time_ms=356074167.140429
  task 0x3180080: time_ms=356075157.58365
  task 0x7f82705749c0: time_ms=356075167.155128
  task 0x3180080: time_ms=356076167.23508
  task 0x7f82705749c0: time_ms=356076167.163529
  task 0x7f82705749c0: time_ms=356077167.131421
  task 0x3180080: time_ms=356077176.204301
  task 0x7f82705749c0: time_ms=356078167.172336
  task 0x3180080: time_ms=356078186.76828
  task 0x7f82705749c0: time_ms=356079167.110302
  task 0x3180080: time_ms=356079195.814623

Under traffic with a run queue of 50k, with non-rt we can see delays
of up to a few hundred ms, while the rt one is stable:

  task 0xf52228e3c580: time_ms=12817821323.738291
  task 0xf52228e3c580: time_ms=12817822375.954267
  task 0xf52228e3c580: time_ms=12817823437.542732
  task 0xf522c85fe340: time_ms=12817823901.552931
  task 0xf52228e3c580: time_ms=12817824487.769129
  task 0xf522c85fe340: time_ms=12817824901.491252
  task 0xf52228e3c580: time_ms=12817825553.539234
  task 0xf522c85fe340: time_ms=12817825901.930177
  task 0xf52228e3c580: time_ms=12817826613.611365
  task 0xf522c85fe340: time_ms=12817826901.94851
  task 0xf52228e3c580: time_ms=12817827659.386720
  task 0xf522c85fe340: time_ms=12817827901.655777
  task 0xf52228e3c580: time_ms=12817828694.795097
  task 0xf522c85fe340: time_ms=12817828901.882341
  task 0xf52228e3c580: time_ms=12817829765.216886
  task 0xf522c85fe340: time_ms=12817829901.723780
  task 0xf52228e3c580: time_ms=12817830844.706481
  task 0xf522c85fe340: time_ms=12817830901.571820
  task 0xf522c85fe340: time_ms=12817831901.440380
  task 0xf52228e3c580: time_ms=12817831951.556375

This indicates that thisshould be a sufficient first step to unblock
haload.
2026-06-24 19:08:08 +02:00
.github CI: github: run illumos job weekly on Mondays at 03:00 instead of monthly 2026-06-03 13:22:04 +02:00
addons MINOR: addons/51degrees: handle memory allocation failures 2026-05-31 10:26:41 +02:00
admin CLEANUP: admin/halog: improve handling of memory allocation errors 2026-05-31 10:30:00 +02:00
dev DEV: patchbot: prepare for new version 3.5-dev 2026-06-03 14:56:22 +02:00
doc MEDIUM: task: add a new flag TASK_RT to permit a task to skip the priority queue 2026-06-24 19:08:00 +02:00
examples EXAMPLES: lua/acme: fix acme-gandi-livedns.lua configuration example 2026-06-15 13:50:22 +02:00
include MEDIUM: task: add a new flag TASK_RT to permit a task to skip the priority queue 2026-06-24 19:08:00 +02:00
reg-tests REGTESTS: quic: test H3 request without content-length 2026-06-24 08:53:04 +02:00
scripts SCRIPTS: announce-release: add a link to the OpenTelemetry filter 2026-05-08 12:05:09 +02:00
src MINOR: debug: add "rt=1" to "debug dev task" to tune the RT flag 2026-06-24 19:08:08 +02:00
tests TESTS: quic: add unit-tests for QUIC TX part 2025-09-08 14:49:03 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore MINOR: tevt/dev: Add term_events tool 2025-01-31 10:41:50 +01:00
.mailmap DOC: update Tim's address in .mailmap 2021-09-16 09:14:14 +02:00
.travis.yml MEDIUM: mworker: remove USE_SYSTEMD requirement for -Ws 2024-11-20 12:07:38 +01:00
BRANCHES CLEANUP: tree-wide: fix typos in user-invisible files 2026-05-13 17:03:48 +02:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.5-dev0 2026-06-03 15:26:45 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2025-04-02 11:12:20 +02:00
INSTALL MINOR: version: mention that it's development again 2026-06-03 15:25:53 +02:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS MAJOR: spoe: Let the SPOE back into the game 2024-05-22 09:04:38 +02:00
Makefile BUILD: makefile: fix build error with GNU make 4.2.1 and /bin/dash 2026-06-03 12:04:21 +02:00
README.md CI: github: replace cirrus by a vmactions/freebsd-vm job 2026-06-03 11:20:31 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 3.4.0 2026-06-03 15:01:51 +02:00
VERSION [RELEASE] Released version 3.5-dev0 2026-06-03 15:26:45 +02:00

README.md

HAProxy

AWS-LC Illumos NetBSD CrossCompile FreeBSD VTest

HAProxy logo

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:

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.