Linux performance tuning

The C10K problem
Old doc but very useful
RH system stat tools

Upgrading Red Hat Linux/Fedora Core with yum

Upgrading Red Hat Linux/Fedora Core with yum
It is possible to upgrade your Red Hat Linux/Fedora Core system using yum instead of the CD/DVD-based install or upgrade option. Only experienced Red Hat/Fedora Core users should attempt this, as the yum upgrade process is not officially supported and may cause problems.