"With the EXT4 file-system having been stabilized with the
Linux 2.6.28 kernel, the Ubuntu developers are preparing to adopt this
evolutionary Linux file-system update. EXT4 will not replace EXT3 as the
default file-system until at least Ubuntu 9.10, but as of yesterday,
Ubuntu 9.04 now has install-time support for EXT4. In this article we
are looking at the EXT4 support within Ubuntu as well as providing a few
Linux file-system benchmarks from a netbook-embedded solid-state drive.
In this article we have published Ubuntu benchmarks of EXT4, EXT3, XFS,
JFS, and ReiserFS file-systems."