A Patch That Can Make Btrfs 5~10% Faster
Written by Michael Larabel in Linux Kernel on 18 February 2012 at 06:58 AM EST. 11 Comments
A patch has been sent over to the Btrfs developers that can result in the next-generation Linux file-system being 5~10% faster in writes by introducing an extent buffer cache for each i-node.

Miao Xie sent over a patch to linux-btrfs asking for comments about this patch that provides an extent buffer cache for each i-node. "This patch introduce extent buffer cache for every i-node. By this way, we needn't search the item from the root of b+ tree, and can save the search time. Besides that we can also reduce the lock contention of the root."

When looking at the small file write performance via sysbench, he found that this patch he wrote could make the file-system 5~10% faster. He plans to run more performance tests soon to validate the work. He also has further cleans to clean-up the patch before asking it be pulled into the tree.

If this per i-node extent buffer cache patch moves quickly, it's possible to become a candidate for the Linux 3.4 kernel release that will happen in a few months. This will also be good news for Fedora 18, which should be the first tier-one distribution using Btrfs by default later in the year.

Benchmarks of Btrfs and EXT4 from the in-development Linux 3.3 kernel are going to be published soon. The most recent EXT4/Btrfs benchmarks on Phoronix as of right now is from the now-stable Linux 3.2 kernel.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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