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With 48 threads, a heavily loaded table with plenty of trackers and rules and a short expiration timer of 10ms saturates the CPU at 232k rps. By carefully using atomic ops we can make sure that t->exp_next and t->task->expire converge to the earliest next expiration date and that all of this can be performed under atomic ops without any lock. That's what this patch is doing in stktable_touch_with_exp(). This is sufficient to double the performance and reach 470k rps. It's worth noting that __stktable_store() uses a mix of eb32_insert() and task_queue, and that the second part of it could possibly benefit from this, even though sometimes it's called under a lock that was already held.
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)