Apache

mod_perl: Performance Tuning

http://perl.apache.org/docs/1.0/guide/performance.html#Choosing_MaxClients apache performance tuning, by mod_perl people

Apache Performance Tuning - DeveloperSide.NET Articles

http://www.devside.net/articles/apache-performance-tuning “Premature optimization is the root of all evil.” – Donald Knuth.

Tuning the Apache MaxClients parameter | 2BITS.com - Drupal Development, Customization and Consulting

http://2bits.com/articles/tuning-the-apache-maxclients-parameter.html

uuasc-ha-cluster-june-2007.pdf (application/pdf Object)

http://www.ufsdump.org/papers/uuasc-ha-cluster-june-2007.pdf Configuring a 2 Node Apache HA Cluster

Tuning LAMP systems, Part 2: Optimizing Apache and PHP

http://www.ibm.com/developerworks/linux/library/l-tune-lamp-2.html?ca=dgr-lnxw01LAMPTuningP2