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Willy Tarreau 61d73137f1 BUG/MEDIUM: clock: also update the date offset on time jumps 
In GH issue #2704, @swimlessbird and @xanoxes reported problems handling
time jumps. Indeed, since 2.7 with commit 4eaf85f5d9 ("MINOR: clock: do
not update the global date too often") we refrain from updating the global
offset in case it didn't change. But there's a catch: in case of a large
time jump, if the poller was interrupted, the local time remains the same
and we return immediately from there without updating the offset. It then
becomes incorrect regarding the "date" value, and upon subsequent call to
the poller, there's no way to detect a jump anymore so we apply the old,
incorrect offset and the date becomes wrong. Worse, going back to the
original time (then in the past), global_now_ns remains higher than the
local time and neither get updated anymore.

What is missing in practice is to immediately update the offset when
detecting a time jump. In an ideal world, the offset would be updated
upon every call, that's what was being done prior to commit above but
it's extremely CPU intensive on large systems. However we can perfectly
afford to update the offset every time we detect a time jump, as it's
not as common.

This needs to be backported as far as 2.8. Thanks to both participants
above for providing very helpful details.

(cherry picked from commit e8b1ad4c2b3985eb9e826fd279e419719a2c03ce)
Signed-off-by: Willy Tarreau <w@1wt.eu>
2024-09-04 17:13:00 +02:00
.github CI: github: upgrade the WolfSSL job to 5.7.0 2024-05-28 19:26:52 +02:00
addons BUG/MINOR: promex: Remove Help prefix repeated twice for each metric 2024-07-03 08:50:39 +02:00
admin BUILD: address a few remaining calloc(size, n) cases 2024-02-10 11:37:27 +01:00
dev DEV: flags/quic: decode quic_conn flags 2024-07-11 15:44:58 +02:00
doc DOC: config: correct the table for option tcplog 2024-09-03 18:49:07 +02:00
examples CLEANUP: assorted typo fixes in the code and comments 2023-11-23 16:23:14 +01:00
include MINOR: channel: implement ci_insert() function 2024-09-03 18:49:07 +02:00
reg-tests REGTESTS: mcli: test the pipelined commands on master CLI 2024-09-03 18:49:07 +02:00
scripts SCRIPTS: git-show-backports: do not truncate git-show output 2024-06-26 15:16:24 +02:00
src BUG/MEDIUM: clock: also update the date offset on time jumps 2024-09-04 17:13:00 +02:00
tests MINOR: ist: define iststrip() new function 2024-04-26 11:29:25 +02:00
.cirrus.yml CI: cirrus-ci: display gdb bt if any 2023-09-22 08:28:30 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore CONTRIB: Add vi file extensions to .gitignore 2023-06-02 18:14:34 +02:00
.mailmap DOC: update Tim's address in .mailmap 2021-09-16 09:14:14 +02:00
.travis.yml CI: travis-ci: temporarily disable arm64 builds 2021-08-07 07:28:15 +02:00
BRANCHES DOC: fix some spelling issues over multiple files 2021-01-08 14:53:47 +01:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.0.4 2024-09-03 15:37:09 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2021-08-16 12:37:59 +02:00
INSTALL DOC: install: don't reference removed CPU arg 2024-07-29 11:56:13 +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: yearly reordering of objects by build time 2024-05-27 19:14:14 +02:00
README DOC: create a BRANCHES file to explain the life cycle 2019-06-15 22:00:14 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 3.0.4 2024-09-03 15:37:09 +02:00
VERSION [RELEASE] Released version 3.0.4 2024-09-03 15:37:09 +02:00

README 

The HAProxy documentation has been split into a number of different files for
ease of use.

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)