http://social.technet.microsoft.com/...6-19437697f62b - this one even corrupts your files
CFQ is very fine for desktop. I have XP next to Kubuntu and from my experience SQL performance sucks badly in Windows XP. It makes Firefox sometimes unusable. In Kubuntu it's very fast and responsive.
FreeBSD devs have done some tests in the past, but it seems they're no longer interested in such comparisons.FreeBSD SMP performace is very close to Linux.