IO_uring Squeezes More Performance With Linux 5.13

Written by Michael Larabel in Linux Storage on 3 May 2021 at 06:08 PM EDT. 8 Comments
Merged as part of the block subsystem changes for the Linux 5.13 were the usual assortment of enhancements to the exciting IO_uring. With this next kernel there is yet even better performance out of this morning Linux I/O interface.

The IO_uring updates for Linux 5.13 include support for multi-shot mode for POLL requests, more efficient reference counting, no longer the need to have a manager thread for each ring, and a wide variety of smaller technical fixes and improvements.

While no super exciting features this cycle for IO_uring, the changes overall seem to amount to a few percentage performance improvements. Linux block maintainer and IO_uring lead developer Jens Axboe of Facebook noted that he's seeing around 5% better performance with this new code in Linux 5.13.

While 5% may not seem too exciting, it's commendable considering how fast IO_uring already is and how well it has been panning out performance and feature wise on prior kernels. So seeing small gains will certainly continue adding up adding up for this asynchronous I/O framework. It was just this past cycle for Linux 5.12 where it enjoyed a ~10% performance boost.
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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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