This article explains the thundering herd problem in Nginx when many workers compete for new connections and provides four practical solutions—accept_mutex, reuseport, multi_accept, and keepalive_timeout—along with configuration examples to improve high‑concurrency performance.
This article explains the thundering herd issue caused by multiple workers waiting on the same socket event, describes how the SO_REUSEPORT socket option eliminates the wasteful wake‑ups, and shows step‑by‑step how Workerman can be configured to use reusePort for better concurrency and throughput.
This article provides an in‑depth analysis of Envoy's outbound request processing, covering listener initialization, the use of SO_REUSEPORT for load distribution, original destination handling, and the detailed steps of connection creation and filter chaining within the Envoy proxy architecture.
An intermittent 403 error caused by nginx reuseport misrouting on a shared IP was traced to kernel listener hash table ordering; upgrading the Linux kernel from 4.14 to 4.16+ resolved the issue by prioritizing IP+PORT over INADDR_ANY lookups.
This article details how to diagnose and resolve Nginx load‑balancing performance issues under extreme concurrency by analyzing NIC packet loss, kernel SYN drops, backlog limits, and applying systematic kernel, network‑card, and Nginx configuration optimizations that raise QPS from 20,000+ to over 40,000.
