In this article are benchmarks of the latest Linux 3.7 kernel development code of the EXT4, XFS, and Btrfs file-systems.
From an SSD-backed Lenovo ThinkPad W510 with an Intel Core i7 720QM CPU and a 160GB Intel SSD, the XFS, EXT4, and Btrfs file-systems were benchmarked. For reference, the Linux 3.5 kernel was also benchmarked on the same system with the three Linux file-systems. Unfortunately, the Linux 3.6.x kernels failed to properly boot on this particular system so there are only Linux 3.5 and 3.7 Git results.
Benchmarking was handled via the Phoronix Test Suite software and the EXT4/XFS/Btrfs file-systems were benchmarked with their stock mount options/settings.