A Patch-Set Making Btrfs ~20% Faster
Written by Michael Larabel in Linux Kernel on 30 September 2012 at 01:00 AM EDT. 7 Comments
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.

I ran stress.sh, xfstests and some other tools to test it, all of them worked well.

As a performance improvement patchset, of course we did performance test. Because this patchset is to improve the b+ tree search, in other words, it improves the performance of the metadata operations, we use file creation test to measure it. So we ran 10 tasks, and all of them created 100000 files in their own directories at the same time. As the result, we found this patchset makes btrfs ~20% faster(98s -> 77s).
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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Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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