All Your Queues Are Belong to Us - The Hunt for a Network Bug in the Kernel

Embark on a thrilling journey through a complex network performance investigation in this 35-minute conference talk by Laurent Bernaille and Eric Mountain from Datadog. Discover how they uncovered lower network throughput on specific Kubernetes clusters, leading to an in-depth exploration of Linux kernel internals. Follow their step-by-step debugging process as they trace packet paths, utilize bpftrace, and ultimately identify a kernel bug affecting transmit queue usage. Learn about their collaboration with the Cilium team to develop an eBPF-based mitigation and the subsequent upstream kernel fix. Gain valuable insights into advanced troubleshooting techniques and the intricacies of network performance optimization in Kubernetes environments.

All Your Queues Are Belong to Us: The Hunt for a Network Bug... - Laurent Bernaille & Eric Mountain