from LWN, a link to Jeffrey W. Baker: ZFS, XFS, and EXT4 compared. (September 5, 2007) http://lwn.net/Articles/247811/ which links to the actual data, but I will quote his summary:
""" Short version: ext4 is awesome. zfs has absurdly fast metadata operations but falls apart on sequential transfer. xfs has great sequential transfer but really bad metadata ops, like 3 minutes to tar up the kernel. """ Regards, ..jim -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
