How to configure Linux to run benchmarks as stable as possible?

I have several long running benchmarks (SPEC CPU 2006 benchmarks) to run on a Linux server. The server is running Gentoo Linux with a Linux Kernel 3.6.11. I saw some big differences between different runs and I'm thinking that it could be some problem with my configuration. I'm the only user of the server. I have already done several configuration changes: - I have disabled the CPU frequency scaling feature of the kernel. - I have removed all cron jobs - I made sure that there were no frequency scaling in the BIOS Is there some others things I should configure/disable/enable in the kernel or on the installation ? I do not need to make the server faster, but I want to make sure that the benchmarks are not encountering pertubations Thanks