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The read-lock contention observed on the update lock while turning it
into an upgradable lock were due to false sharing with the nearby
updates. Simply moving the lock alone into its own cache line is
sufficient to almost double the performance again, raising from 2355
to 4480k RPS with very low contention:
Samples: 1M of event 'cycles', 4000 Hz, Event count (approx.): 743422995452 lost
Overhead Shared Object Symbol
15.88% haproxy [.] stktable_lookup_key
5.94% haproxy [.] ebmb_lookup
5.69% haproxy [.] http_wait_for_request
3.66% haproxy [.] stktable_touch_with_exp
2.62% [kernel] [k] _raw_spin_unlock_irqrestore
1.86% haproxy [.] http_action_return
1.79% haproxy [.] stream_process_counters
1.78% [kernel] [k] skb_release_data
1.77% haproxy [.] process_stream
Unfortunately, trying to move the line anywhere else didn't work,
despite the remaining holes, because this structure is not quite
clean. This adds 64 bytes to a struct that was already 768 long,
so it's now 832. It's possible to repack it a little bit and regain
these bytes by removing the THREAD_ALIGN before "keys" because we
rarely use the config stuff, but that's a bit unsafe.
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| addons | ||
| admin | ||
| dev | ||
| doc | ||
| examples | ||
| include | ||
| reg-tests | ||
| scripts | ||
| src | ||
| tests | ||
| .cirrus.yml | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| BRANCHES | ||
| BSDmakefile | ||
| CHANGELOG | ||
| CONTRIBUTING | ||
| INSTALL | ||
| LICENSE | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
| 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)