Linux 3.0, 3.4, 3.10, 3.12 AMD Kernel Benchmarks
With some of the file-system tests there were some variations in the EXT4 performance when comparing the kernel releases between 3.0 and 3.12, but the results would have probably been more interesting if Btrfs was used instead given its still evolving state.
There isn't too much variation in the computational tests...