When TCP_DEFER_ACCEPT is enabled on the listening socket: - HTTP-Keep-Alive requests get a boost;
- non-HTTP-Keep-Alive requests are delayed after a while. The problem happens with high concurrencies only. This has been tested with various HTTP servers and is a consistant behavior on Linux Ubuntu 8.1+. The higher the value for TCP_DEFER_ACCEPT, the faster HTTP servers get into trouble (when they receive ab connections without -k): ab -t 100 -c900 http://a.b.c.d/100.html (a 100-byte file) Anyone having a clue why this is happening? (HTTP Keep-Alives being a persistant TCP connection, it is strange to see TCP_DEFER_ACCEPT giving them a boost) (inversely, non-HTTP Keep-Alives being new TCP connections, it is strange to see TCP_DEFER_ACCEPT delaying them) Thanks for any pointer. ** Changed in: apache2 (Ubuntu) Status: Triaged => Invalid ** Converted to question: https://answers.launchpad.net/ubuntu/+source/apache2/+question/99261 -- TCP_DEFER_ACCEPT causes random HTTP connection failures in load-balanced web-server farms https://bugs.launchpad.net/bugs/134274 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to apache2 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
