EXT4, Btrfs, NILFS2 Performance Benchmarks

The big problem with Linux filesystem benchmarks is that the filesystems are so tuneable the conclusions can often be better stated as "it is possible to tune file system X to perform badly" rather than "X is faster than Y".

For example, SQLite is known to use fsync, and btrfs fared poorly there, so can we infer that btrfs doesn't handle fsync well with a particular pattern of writes / etc. beforehand?

It'd be nice to see a write up on the current state of BtrFS from someone involved in the project.

Even so, it's a year-old benchmark.