Btrfs To Ship Multiple Performance Improvements In The Next Linux Kernel

Written by Michael Larabel in Linux Storage on 22 October 2018 at 03:34 PM EDT. 71 Comments
Adding to the excitement around Linux 4.20~5.0 are now multiple performance improvements to the Btrfs file-system to be presented for this next Linux kernel release.

Btrfs offers a lot of features not readily available by other in-tree Linux file-systems, but even with all of the features like SSD optimizations, its performance hasn't been all that staggering (in part because, yes, it is copy-on-write by default that does hurt some workloads). But come Linux 4.20~5.0, there should be multiple speed-ups to Btrfs.

David Sterba sent in the Btrfs file-system updates today for this new kernel merge window. Besides the usual churn of fixes are "nice performance improvements" affecting a range of benchmarks and multi-threaded workloads to help those I/O benchmark numbers as well as needing fewer context switches and overall better memory allocation characteristics.

The Btrfs speed boosts come from eliminating some blocking code, qgroups improvements, and other low-level changes.

Btrfs users curious about the dozens of changes for this next kernel version can find the details via this pull request. Yes, I'll soon be running some fresh Btrfs file-system benchmarks.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 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 automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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