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By Zayden R., June 21, 2026
Linux engineers are comparing epoll and io_uring to determine which offers better performance for I/O operations. Each has its strengths, but io_uring's newer design provides a modern approach to asynchronous I/O.
Linux enthusiasts and professionals alike are taking a closer look at epoll and io_uring, two mechanisms for handling I/O operations in Linux. This discussion is particularly relevant for those seeking to optimize the performance of their systems. With epoll being a long-standing solution, and io_uring representing a more modern approach, the choice between the two can have significant implications for system performance.
Epoll, introduced in Linux 2.5.44, has been a staple for asynchronous I/O. It's known for its scalability and efficiency, particularly in network servers handling numerous connections. However, as demands for higher performance and lower latency continue to grow, developers have been seeking alternatives.
Enter io_uring, a newer addition that has been available since Linux 5.1. It aims to address some of the limitations of epoll by offering a more efficient mechanism to submit and complete I/O operations without the need for context switches. This can potentially reduce overhead and improve throughput, making it an attractive option for high-performance applications.
Despite its promise, io_uring is not without its challenges. It requires a more recent kernel, and its adoption may demand significant changes in existing codebases. However, for those willing to make the leap, io_uring provides a glimpse into the future of Linux I/O operations, offering a powerful tool for developers aiming to push the boundaries of what's possible with Linux-based systems.
Choosing between epoll and io_uring depends on specific use cases and system requirements. While epoll remains a reliable choice for many, io_uring's potential for greater efficiency and performance is hard to ignore. For Linux engineers, the decision may ultimately come down to balancing the need for stability with the desire for innovation.
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