At long last here is a good data set for filesystem comparison. It is
from 2.6.34-rc3 (unpatched). It compares ext3 ext4 ext4-nobarrier,
btrfs, btrfs-nocow, xfs and jfs on a software raid setup with a decent
spindle count.
http://btrfs.boxacle.net/repository/raid/2010-04-14_2004/2.6.34-rc3/2.6.34-rc3.html
As we know touring barriers off helps a lot with ext4 on this machine.
I think Steve Pratt send some notification to the btrfs folks. Feel free
to point others at this data.
A history from this setup can be found here: (mostly btrfs related
data)
http://btrfs.boxacle.net/repository/raid/history/History.html
I hope to be do these large data set runs once in every major kernel
revision life cycle.
Thanks,
Keith Mannthey
LTC FS-Dev