"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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