Linux 3.14 File-System HDD Benchmarks
With testing from this SSHD, Btrfs was by far the fastest file-system but overall there wasn't too much of a difference between the Linux 3.12 and 3.14 kernels with the popular EXT4, Btrfs, and XFS file-systems tested. On some systems we did see performance regressions with Linux 3.13, but for this Core i7 Ivy Bridge Extreme box and the Seagate hard drive backed by a small solid-state cache there wasn't much difference in performance.
FS-Mark also didn't indicate much in the way of performance for any of the three tested Linux file-systems besides Btrfs offering the best performance followed by XFS and then EXT4.
With FS-Mark for four threads the results were still too close to call between kernel releases but EXT4 and XFS were now equally the fastest over Btrfs with it suffering in the multi-threaded disk test.