PostgreSQL on EXT4, XFS, BTRFS and ZFS

http://www.slideshare.net/fuzzycz/postgresql-on-ext4-xfs-btrfs-and-zfs

Which file system to use for a PostgreSQL database? At Immobiliare.it we use PostgreSQL mainly for PostGIS and OpenStreetMap, hence this benchmark helps a lot to choose the underlying file system.