Lighttpd

http://www.lighttpd.net/documentation/performance.html

It would probably be useful to include the OS-specific error messages related to specific tuning options. This would allow folks to more readily match conditions against fixes; or hit upon the right docs when searching.

Kernel messages can be checked via 'dmesg' or by checking an appropriate log file generated by syslog (see /etc/syslog.conf and /var/log dir).

With Linux 2.6, "Out of socket memory" kernel messages appear to mean you should look at increasing tcp_mem. CentOS 4.2 has a particularly low stock value. Fedora Core 4 uses "net.ipv4.tcp_mem = 393216 524288 786432"

With Linux 2.6, "TCP: too many of orphaned sockets" kernel messages appear to mean you should look at increasing net/ipv4/tcp_max_orphans. CentOS 4.2 has a particularly low stock value of 1000.

-- moorman