Linux Optimization Shows +5% For EXT4, XFS After Moving Around 2 Lines Of Code

6 hours ago

Linux 7.2 includes an optimization for EXT4 and XFS file systems that shows a 5% IOPS improvement when using NVMe SSD storage and IO_uring.
The optimization involves moving two lines of code to skip a memset in iomap_iter(), reducing wasted memory write bandwidth.
The change was discovered by Bytedance engineer Fengnan Chang and is part of VFS pull requests for the kernel.
The same pull request also adds VFS infrastructure to support FS-VERITY for XFS with a post-EOF Merkle tree.
Linux kernel versions consistently deliver exciting performance improvements with each new release.

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