So after doing some more benchmarks, I decided to take the leap and move to nginx for the web server here at The Eleven. After 15+ years of using apache, I decided that for the sake of memory and CPU that I'd jump to nginx. Rewriting server rewrites has been a pain in the ass for various php apps that liberally use .htaccess for rewrites, but I finished it off finally for all of my vhosts.
The one app that I haven't moved to nginx directly is nagios, so nginx just proxies it to apache.
I haven't ...