For more than a year we have been publishing EXT4 benchmarks and on several other occassions. The EXT4 file-system started out with great performance numbers, but over the course of several kernel release cycles its performance has dramatically degraded. With the Linux 2.6.32 kernel, EXT4 lost much ground while Btrfs gained and before that a single commit severely dampened the FS performance. Through our kernel test farm and Phoromatic Tracker that provides daily kernel benchmarks at kernel-tracker.phoromatic.com, the performance of EXT4 is looking to be even worse with the forthcoming Linux 2.6.33 kernel.
Google also happened to just hire Ted Ts'o, the widely known Linux kernel developer who is largely responsible for the EXT4 file-system work. According to a blog comment, one of the first things he will be working on while enjoying the Googleplex is EXT4. Hopefully he will be able to drive some better performance back into this file-system that's now used by default in most desktop Linux distributions.
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