There is a buzz over the last years about which operating system is more efficient as a web server platform. We are using OAS as our web and application server (which based on Apache as web server) and nowadays did a research to compare Windows 2003 Enterprise R2 vs Red Hat Enterprise Linux 4 and got a really promising winner...
I will post the results soon but for now you can go visit this web site which did a similar benchmark and got some really confusing results - which we got as well at first, but after some research and learning were fixed.