A Patch-Set Making Btrfs ~20% Faster
A revised patch-set was published a few days ago that can make meta-data operations for the Btrfs file-system approximately 20% faster.
The latest patches build upon what I wrote about in February with A Patch That Can Make Btrfs 5~10% Faster. The idea comes down to providing an extent buffer cache for each i-node so that the item doesn't need to be searched from the root of a B+ tree everytime, thereby making searches quicker. The earlier patch wasn't merged but now it's up to a second version consisting of three patches and a stated 20% performance improvement for meta-data operations.
This patchset introduce extent buffer cache to btrfs. The basic idea is to reduce the search time and the contentions of the extent buffer lock by re-using the last search result.Besides providing an extent buffer cache for each i-node, a change now is also having extent buffer caches for delayed i-nodes and delayed reference with the Btrfs file-system. Hopefully the work will be merged soon but it may be too late for being properly vetted for the Linux 3.7 kernel. The patches are currently residing on the kernel mailing list.
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