Understanding Linux I/O Schedulers: NOOP, CFQ, Deadline, and Anticipatory

Linux employs four main I/O schedulers—NOOP, Anticipatory, Deadline, and CFQ—to manage block device request queues, balancing throughput and latency through techniques like request merging, sorting, and priority handling, with each algorithm suited to specific hardware and workload characteristics.

AnticipatoryCFQDeadline

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Understanding Linux I/O Schedulers: NOOP, CFQ, Deadline, and Anticipatory

Liangxu Linux

Aug 31, 2022 · Fundamentals

Understanding Linux I/O Schedulers: NOOP, CFQ, Deadline, and Anticipatory

This article explains the four Linux kernel I/O schedulers—NOOP, Anticipatory, Deadline, and CFQ—covering their design goals, how they manage request queues through merging and sorting, and when each scheduler is best suited for different storage hardware and workloads.

AnticipatoryCFQDeadline

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