"While we have already delivered a number of benchmarks from the
Linux 2.6.39 kernel, surprisingly we have not yet published any new
file-system benchmarks from this latest stable Linux kernel
release.
"Fortunately, that has changed today with a fresh round of
Btrfs, EXT4, and XFS file-system benchmarks on the Linux 2.6.39
kernel and compared to the preceding 2.6.38 and 2.6.37 kernel
releases."