Linux 3.16 File-System Tests On A Hard Drive
Aside from an improvement for EXT4 with Linux 3.16 in the first FS-Mark run (1000 files, 1MB size of the files), the performance between 3.15 and 3.16 Git for Btrfs / EXT4 / XFS was rather unchanged when tested from the Western Digital VelociRaptor HDD.
EXT4 saw a small rise in performance out of Linux 3.16 on the HDD.