In case you haven't noticed, the schedule for pgconf.eu
2015 was published a few days ago. One of my talks is called PostgreSQL Performance on EXT4, XFS, F2FS, BTRFS and ZFS and aims to compare PostgreSQL performance of modern Linux file systems (and also impact of various tuning options like write barriers, discard etc.). It's not an entirely new talk - it's a reworked (and significantly improved) version of a talk I gave on 5432 conference in May.
One of the rather surprising results was the EXT4 vs XFS comparison - even though XFS is usually presented and perceived as the faster option (and EXT4 as the more "conservative" choice), the results were quite clearly in favor of EXT4. The difference was ~10%, so not a negligible difference. Let me briefly discuss this and also show some of the updated results that I'll present in Vienna. And come to pgconf.eu
and see the whole updated talk!