This article delves into a practical case study of eBPF performance optimization, detailing the complete process from identifying bottlenecks with profiling tools to developing a kernel patch to resolve them. The content reveals the critical role of eBPF map types in data transfer, particularly the historical lesson where the absence of ringbuf maps led developers to mistakenly use array maps. Through specific examples, the author emphasizes that kernel-to-userspace data transfer should prioritize ringbuf maps over traditional array maps to enhance performance. This offers valuable insights for system optimization, kernel development, and performance monitoring, demonstrating the practical application value of cutting-edge technology in solving real-world problems.
