canonical libwebsockets.org websocket library
65b0e91061
From an idea by Edwin van den Oetelaar <oetelaar.automatisering@gmail.com> When testing libwebsockets with ab, Edwin found an unexpected bump in the distribution of latencies, some connections were held back almost the whole test duration. http://ml.libwebsockets.org/pipermail/libwebsockets/2013-January/000006.html Studying the problem revealed that when there are mass pending connections amongst many active connections, we do not service the listen socket often enough to clear the backlog, some seem to get stale violating FIFO ordering. This patch introduces listen socket service "piggybacking", where every n normal socket service actions we also check the listen socket and deal with pending connections there. Normally, it checks the listen socket gratuitously every 10 normal socket services. However, if it finds something waiting, it forces a check on the next normal socket service too by keeping stats on how often something was waiting. If the probability of something waiting each time becomes high, it will allow up to two waiting connections to be serviced for each normal socket service. In that way it has low burden in the normal case, but rapidly adapts by detecting mass connection loads as found in ab. Signed-off-by: Andy Green <andy.green@linaro.org> |
||
|---|---|---|
| lib | ||
| m4 | ||
| scripts | ||
| test-server | ||
| win32port | ||
| .gitignore | ||
| autogen.sh | ||
| configure.ac | ||
| COPYING | ||
| INSTALL | ||
| libwebsockets-api-doc.html | ||
| libwebsockets.pc.in | ||
| libwebsockets.spec | ||
| Makefile.am | ||
| README-test-server | ||