Results folders:
..//2010-08-20_1016/btrfs8-20-base/btrfs1.ffsb.random_writes__threads_0128.10-08-20_11.38.21
..//2010-08-20_1016/btrfs8-20-base-nocow/btrfs1.ffsb.random_writes__threads_0128.10-08-20_15.35.09
..//2010-08-21_1031/btrfs8-20-perfpatch/btrfs1.ffsb.random_writes__threads_0128.10-08-21_11.53.32
..//2010-08-21_1031/btrfs8-20-perfpatch-nocow/btrfs1.ffsb.random_writes__threads_0128.10-08-21_15.52.42