Epoll vs. Io_uring in Linux

The article compares epoll and io_uring, two Linux asynchronous I/O handling systems, explaining how the author's team evolved their TinyGate reverse proxy project through both technologies. While epoll relies on frequent syscalls to check when I/O is ready (causing significant overhead), io_uring batches operations and notifies when I/O is complete, dramatically reducing context switches and syscall overhead. On modern Linux systems (kernel v5.1+), io_uring is generally the superior choice due to its efficiency, though it represents a significant architectural shift from epoll's readiness model to a completion model.