Finding the Fastest Filesystem, 2011 Edition

"In my previous report about journaling filesystem benchmarking using dbench, I observed that a properly-tuned system using XFS, with the deadline I/O scheduler, beat both Linux's ext3 and IBM's JFS. A lot has changed in the three years since I posted that report, so it's time to do a new round of tests. Many bug fixes, improved kernel lock management, and two new filesystem (btrfs and ext4) bring some new configurations to test.

"Once again, I'll provide raw numbers, but the emphasis of this report lies in the relative performance of the filesystems under various loads and configurations. To this end, I have normalized the charted data, and eliminated the raw numbers on the Y-axes. Those who wish to run similar tests on their own systems can download a tarball containing the testing scripts; I'll provide the link to the tarball at the end of this report."

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