io_uring

Purpose

Guide agents through Linux io_uring: the submission/completion queue model (SQE/CQE), liburing API, multi-shot accept/recv, provided buffer rings, fixed files and registered buffers, zero-copy send, Rust integration with tokio-uring, performance comparison with epoll, and security considerations.

When to Use

• Building a high-throughput network or disk server on Linux 5.1+
• Replacing epoll + thread pool with fewer syscalls
• Implementing multi-shot accept/recv for connection-heavy services
• Using zero-copy networking with IORING_OP_SEND_ZC
• Integrating async I/O in Rust via tokio-uring
• Evaluating io_uring vs epoll for your workload

Workflow

1. SQ/CQ model