Besides the Linux graphics stack
being talked about this week at Linux.Conf.Au, there was also a talk by Ted Ts'o about the EXT4 file-system
Ted's talk is entitled "making file-systems scale" and we mentioned his talk in advance when he was commenting on EXT4 being within striking distance of XFS
After watching the video you may be interested in our latest Linux file-system benchmarks
that compare the performance of ZFS, EXT4, Btrfs, and XFS.