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Earlier this week there were Fedora 15 vs. Ubuntu 11.04 benchmarks looking at the overall system performance as well as the power consumption. Both of these Linux distributions had performed close to one another, as is expected considering the similarities in their kernel and other packages, but there were some discrepancies in the disk tests. Speculations in the forums were that some of the performance differences might be attributed to SELinux, so here are some tests seeing the performance impact of SELinux on Fedora 15.
For home installations selinux is more trouble than it is worth. For larger networks that is probably a different story. If you want disable selinux:
Log into root. cd to /etc/selinux. Open the config file in an editor. Change SELINUX=enforcing to SELINUX=disable. Restart the X server or reboot the machine.
I don't agree with you at all, BFM. It's pretty darned easy to setup SELinux in Permissive Mode, which means it blocks nothing but logs. Use the logs to build a policy that makes sense and you are done. It isn't much effort but it does enhance security quite a bit. Considering I mostly run my business out of my home office I have extra incentive to leave it on.
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Log into root. cd to /etc/selinux. Open the config file in an editor. Change SELINUX=enforcing to SELINUX=disable. Restart the X server or reboot the machine.