Understanding Linux Kernel’s Four I/O Scheduler Algorithms

The article explains Linux kernel’s four I/O schedulers—Noop, CFQ, Deadline, and Anticipatory—detailing their queue management, merging and sorting mechanisms, priority handling, and hardware‑specific suitability, helping readers choose the appropriate scheduler for spinning disks, SSDs, or database workloads.

Linuxanticipatorycfq

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Understanding Linux Kernel’s Four I/O Scheduler Algorithms

Raymond Ops

Apr 7, 2025 · Operations

Choosing the Right Linux I/O Scheduler: Algorithms, Commands, and Performance Benchmarks

This article explains Linux I/O scheduler concepts, compares the main algorithms (noop, cfq, deadline), shows how to view and modify scheduler settings on CentOS 6/7, and presents performance test results indicating the optimal scheduler choices for SSD and SAS disks.

SSDio schedulerperformance

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Choosing the Right Linux I/O Scheduler: Algorithms, Commands, and Performance Benchmarks

OPPO Kernel Craftsman

May 8, 2020 · Fundamentals

Linux blk-mq Multi-queue Block Device Layer Framework and Implementation

The Linux blk-mq framework replaces the legacy single-queue block layer with a two-queue architecture—per-CPU software queues and hardware dispatch queues—eliminating lock contention and interrupt overhead, pre-allocating request tags, and supporting modern multi-queue I/O schedulers to fully exploit high-IOPS SSD performance.

Multi-QueueSSD optimizationStorage Subsystem

0 likes · 20 min read

Linux blk-mq Multi-queue Block Device Layer Framework and Implementation