Here are the benchmarks that evaluates FreeBSD 5.2, FreeBSD 4.9, DragonFly -current, NetBSD 1.6.2, Linux 2.4.25 and Linux 2.6.5 systems

[MACHINE <neo_match@xxxxxxxxxxx>]

Quote from the article
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What is benchmarked?

This benchmark evaluates FreeBSD 5.2, FreeBSD 4.9, DragonFly -current, 
NetBSD 1.6.2, Linux 2.4.25 and Linux 2.6.5 systems. Since "Linux" does 
not represent a complete system, Gentoo 2004.0 (with the specified 
kernels added) is used. Each of the kernels used have had no custom 
optimizations turned on unless otherwise stated.

Benchmarking software was: bytebench 3.1, bonnie++ 1.93.03, ubench 0.3, 
postgresql 7.4.1, apache 1.3.29 and php 4.3.4.
Why another benchmark?

This benchmark was conceived as an opportunity for me to get some "real 
numbers" behind my choice of OS for development and deployment of a web 
CMS (content management system). I've been a FreeBSD advocate in my 
community for several years, but my justifications were based mostly on 
"3rd party" evidence (various other benchmarks and articles, and 
tracking the development mailing lists) and my subjective feelings that 
the system is "more right" for the job (actually, most of the jobs :) ). 
Now the opportunity has presented itself for me to do some relatively 
extensive benchmarking and usage of various systems, and so add numbers 
to my claims.

Even if I'm biased towards the BSD systems, I tried to make the 
benchmarking protocol as fair as possible for all systems (as will be 
apparent, I hope, from the rest of the article). The fact that I am 
inclined to use FreeBSD doesn't imply that I have negative feelings 
towards Linux-based systems, or that I'm not competent or comfortable 
using it. My day-job is mostly systems administration, and these days 
you have to be competent in many different systems.

Open this .PDF file to see the results:
http://geri.cc.fer.hr/~ivoras/web2/papers/osbench.pdf