fcab647613
This reduces the avg wakeup latency of sc_conn_io_cb() from 1900 to 51us.
The L2 cache misses from from 1.4 to 1.2 billion for 20k req. But the
perf is not better. Also there are situations where we must not perform
such wakeup, these may only be done from h2_io_cb, hence the test on the
next_tasklet pointer and its reset when leaving the function. In practice
all callers to h2s_close() or h2s_destroy() can reach that code, this
includes h2_detach, h2_snd_buf, h2_shut etc.
Another test with 40 concurrent connections, transferring 40k 1MB objects
at different concurrency levels from 1 to 80 also showed a 21% drop in L2
cache misses, and a 2% perf improvement:
Before:
329,510,887,528 instructions
50,907,966,181 branches
843,515,912 branch-misses
2,753,360,222 cache-misses
19,306,172,474 L1-icache-load-misses
17,321,132,742 L1-dcache-load-misses
951,787,350 LLC-load-misses
44.660469000 seconds user
62.459354000 seconds sys
=> avg perf: 373 MB/s
After:
331,310,219,157 instructions
51,343,396,257 branches
851,567,572 branch-misses
2,183,369,149 cache-misses
19,129,827,134 L1-icache-load-misses
17,441,877,512 L1-dcache-load-misses
906,923,115 LLC-load-misses
42.795458000 seconds user
62.277983000 seconds sys
=> avg perf: 380 MB/s
With small requests, it's the L1 and L3 cache misses which reduced by
3% and 7% respectively, and the performance went up by 3%.
HAProxy
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:
- 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)
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.