InfoWorld benchmarks the new 2.6 versus the 2.4 linux kernels. Performance enhancements seem to be significant. "If commercial Unix vendors werent already worried about Linux, they should be now. Linux has seen wide deployment in datacenters, generally as a Web server or a file server, or to handle network tasks such as DNS and DHCP, but not as a platform for running mission-critical enterprise applications. Solaris, AIX, or HP/UX typically get the nod when an application demands the highest levels of performance and scalability. The recent release of a new Linux kernel, v2.6, promises to change that."