Linux Kernels Compared: 2.6.4 vs. 2.4.25
2CPU.com has an article posted comparing the performance of Linux kernels 2.6.4 and 2.4.25 under a variety of server-oriented benchmarks. Their Apache and MySQL results were especially interesting. It's a good read for those of us debating whether or not to update our production machines from 2.4 to 2.6.
