Bytedance eBPF Networking Performance Enhancement

This technical report details Bytedance's implementation of eBPF technology to enhance networking performance across its data centers. As Bytedance scaled its operations, it faced significant challenges with its existing container networking solution, which relied on virtual Ethernet devices. Key issues included performance bottlenecks, stability concerns, and kernel version constraints. To address these challenges, Bytedance adopted eBPF, a technology that allows for dynamic reprogramming of the Linux kernel, enabling a redesign of its container networking stack. The report outlines the key steps taken in the implementation, including the introduction of netkit, a new eBPF-powered networking device, and a rolling upgrade strategy to ensure minimal disruption during the transition. The results demonstrated significant performance gains, improved scalability, and operational benefits, showcasing the effectiveness of eBPF in large-scale networking environments. The report concludes with Bytedance's future plans to further explore eBPF's potential in optimizing network performance and expanding its applications.