August 9, 2010

Btrfs Did Regress Hard In The Linux 2.6.35 Kernel

This morning we published benchmarks of ZFS, EXT4, and Btrfs when running these three popular file-systems off a high-performance OCZ Vertex 2 solid-state drive and also a 7200RPM notebook hard drive. To a fair amount of surprise, the EXT4 file-system ended up beating out Btrfs on the SSD in a number of tests, which was a change from our tests when using the EXT4/Btrfs modules on previous kernels. It was even more surprising since Btrfs has an SSD-optimized mode where as EXT4 does not. However, it turns out this is part of a major performance regression for this file-system in the Linux 2.6.35 kernel...


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