Does SELinux Slow Down Fedora 15?

At least for the Intel Atom netbook, having SELinux enabled with Fedora's default policy appears to have no real impact on the OpenGL gaming performance.

With the Apache web-server disk test, one of the benchmarks where Fedora 15 had fell behind Ubuntu 11.04, there was a difference when SELinux was enabled (with either the enforcing or permissive modes) and when it was disabled. When switching off SELinux, the Apache performance went up by nearly 11% for this low-power Intel system.

With the PostgreSQL database benchmark, the SELinux settings yielded minimal differences in the number of transactions per second that could be sustained.