IO_uring Is Maturing Well On Linux For Faster & More Flexible I/O - Benchmarks On Linux 5.6

Written by Michael Larabel in Linux Storage on 18 March 2020 at 03:00 AM EDT. 19 Comments
Since its introduction in Linux 5.1, IO_uring has been coming together quite nicely and getting better with each new kernel release. IO_uring is the effort for delivering faster and more efficient I/O by avoiding excess copies and other efficiency improvements over the existing Linux AIO code. Here are some comparison benchmarks off Linux 5.6 Git.

IO_uring has been maturing well with each new kernel release for new features, fixes, and further optimizations. Linux 5.6 seems to be in very good shape for IO_uring and we should see more adoption of this new Linux kernel interface this year. Particularly once Ubuntu 20.04 LTS ships with being a major long-term support release on a now-supported kernel that will hopefully spur the adoption. But there's been work by RocksDB and other projects in exploring IO_uring for faster I/O potential.

Those behind on their IO_uring reading can see the likes of the whitepaper and for a more convenient overview the slide deck above.
FIO IO_uring Corsair Force MP600  Performance

Around the time of Linux 5.6 going stable I should hopefully have the time for a broader set of IO_uring benchmarks on a diverse set of hardware, but for now here are some numbers I am seeing on a NVMe SSD in comparing FIO with IO_uring versus the Linux AIO code-path.

Certainly looking forward to seeing more real-world programs make use of IO_uring as the year progresses.
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Michael Larabel

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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