Network Processing Optimization in High-Load Systems

▤ Summary

This article explains how to improve network processing in high-load systems, especially for VPN services. It compares blocking sockets, non-blocking polling, select, epoll, and multithreaded UDP handling, showing where each approach breaks down. It then focuses on WireGuard and demonstrates how eBPF can help distribute UDP traffic across sockets more efficiently. The article also highlights the performance gains from this approach and shows example code for implementing reusable-port selection with eBPF and libbpf. Overall, it argues that eBPF is a practical way to scale VPN packet handling on Linux.

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