3.10
3.9
Btrfs:
native RAID 5 and 6 support.
LVM:
dm-cache(SSD caching) (DOC: cache-policies.txt cache.txt) <-- user mode: flashcache and bcache
Net:
SO_REUSEPORT
(multiple web server processes or threads to open individual sockets to listen on port 80)
3.8