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HAProxy - Load balancer
b7ba1d9011
On connection error processing, we can see massive storms of calls to pendconn_cond_unlink() to release a possible place in the queue. For example, in issue #908, on average half of the threads are caught in this function via back_try_conn_req() consecutive to a synchronous error. However we wait until grabbing the lock to know if the pendconn is effectively in a queue, which is expensive for many cases. We know the transition may only happen from in-queue to out-of-queue so it's safe to first run a preliminary check to see if it's worth going further. This will allow to avoid the cost of locking for most requests. This should not change anything for those completing correctly as they're already run through pendconn_free() which doesn't call pendconn_cond_unlink() unless deemed necessary. |
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| contrib | ||
| doc | ||
| examples | ||
| include | ||
| reg-tests | ||
| scripts | ||
| src | ||
| tests | ||
| .cirrus.yml | ||
| .gitattributes | ||
| .gitignore | ||
| .travis.yml | ||
| BRANCHES | ||
| CHANGELOG | ||
| CONTRIBUTING | ||
| INSTALL | ||
| LICENSE | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
| ROADMAP | ||
| SUBVERS | ||
| VERDATE | ||
| VERSION | ||
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)