Mod_perl and Signals
http://coding.derkeiler.com/Archive/Perl/comp.lang.perl.misc/2007-05/msg00808.html note about suing posix signals with mod_perl
Mod_perl
mod_perl: Performance Tuning
http://perl.apache.org/docs/1.0/guide/performance.html#Choosing_MaxClients apache performance tuning, by mod_perl people