This paper by Gregory McGarry presents a suite of benchmarks and results for comparing the performance of these operating systems. The benchmarks target core operating system functionality, server scalability and thread implementation.
Vice President of firm. Main business is embedded market, markets NetBSD as an embedded OS, and sells boxed release. Says how it is better than VXWorks, Linux, QNX, Windows CE. Short article with forum comments. [OSNews.com]