Linux kernel 3.6 has been released [https://lkml.org/lkml/2012/9/30/152]. There are new features in Btrfs: subvolume quotas, quota groups and snapshot diffs (aka "send/receive"). It also includes support for suspending to disk and memory at the same time, a TCP "Fast Open" mode, a "TCP small queues" feature to fight bufferbloat; support for safe swapping over NFS/NBD, support for the PCIe D3cold power state; and VFIO, which allows safe access from guest drivers to bare-metal host devices. Many small features and new drivers and fixes are also available. Here's the full list of changes [http://kernelnewbies.org/Linux_3.6]

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