Why the Thundering Herd Problem Slows Your Linux Server and How to Fix It

The thundering herd problem in Linux causes multiple processes or threads to wake up simultaneously for a single event, leading to wasted CPU cycles, excessive context switches, lock contention, and severe performance degradation, but it can be mitigated with kernel tweaks, epoll flags, SO_REUSEPORT, thread pools, and other strategies.

Linux performanceacceptepoll

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Why the Thundering Herd Problem Slows Your Linux Server and How to Fix It

Linux Kernel Journey

Dec 24, 2024 · Operations

How to Use tcpw with eBPF to Capture Curl’s Five‑Tuple Information

This article introduces tcpw, a small eBPF‑based utility that traces TCP, UDP, and Unix‑domain sockets to display the five‑tuple of commands like curl or telnet, explains its command‑line options, shows concrete usage examples, and details the underlying BPF and Go implementation, including connect, accept, and fork tracing.

GoLinux tracingaccept

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How to Use tcpw with eBPF to Capture Curl’s Five‑Tuple Information

Liangxu Linux

Aug 18, 2024 · Backend Development

Why Does the Thundering Herd Problem Still Appear with epoll? Deep Dive and Fixes

This article explains the thundering herd phenomenon in multi‑process/thread servers, details its performance costs, demonstrates the issue with accept() and epoll_wait() through C examples, explores thread‑level herd, and presents mitigation techniques such as accept mutexes, SO_REUSEPORT, and Nginx's handling.

Linux kernelSO_REUSEPORTaccept

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Why Does the Thundering Herd Problem Still Appear with epoll? Deep Dive and Fixes

Open Source Linux

Jun 18, 2024 · Backend Development

Understanding and Solving the Linux Thundering Herd Problem

This article explains the Linux thundering herd phenomenon, its impact on processes, threads, and epoll, demonstrates it with C code examples, analyzes system overhead, and presents mitigation techniques such as accept mutex, SO_REUSEPORT, and proper locking to improve server performance.

LinuxSO_REUSEPORTaccept

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Understanding and Solving the Linux Thundering Herd Problem

Tencent Cloud Developer

Jul 20, 2022 · Fundamentals

Deep Dive into the TCP Three‑Way Handshake from the Linux Kernel Perspective

The article explains how the Linux kernel implements the TCP three‑way handshake, detailing server listen queue allocation, client connect port selection and SYN transmission, SYN‑ACK processing, state transitions, request‑socket management, full‑connection queue handling, and the final accept call, plus tuning tips.

Linux kernelNetwork StackTCP

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Deep Dive into the TCP Three‑Way Handshake from the Linux Kernel Perspective

ITFLY8 Architecture Home

Apr 17, 2018 · Fundamentals

Demystifying TCP Socket Lifecycle: From Creation to Closure

This article explains the TCP connection process, detailing socket creation, the roles of send and receive buffers, the functions socket(), bind(), listen(), accept(), and how address/port reuse and SYN flood mitigation affect performance and reliability.

LinuxTCPaccept

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Demystifying TCP Socket Lifecycle: From Creation to Closure