Btrfs In Linux 4.4 Has Many Improvements/Fixes
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The Btrfs file-system in Linux 4.4 has a number of sub-volume quota improvements, many code clean-ups, and a number of allocator fixes based upon their usage at Facebook. The allocator fixes should also help improve the RAID 5/6 performance when the file-system is mounted with ssd_spread as previously it hit some CPU bottlenecks.
More details on the tons of Btrfs file-system changes slated for Linux 4.4 can be found via this kernel mailing list message.
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