UCloud Tech
Feb 1, 2019 · Backend Development
Why a Zero‑Byte Packet Stopped a High‑Speed Load Balancer and How It Was Fixed
This article details the discovery, analysis, and resolution of a DPDK bug that caused a zero‑byte IP fragment to fill transmission queues, leading to packet loss and tx‑hang in UCloud's high‑availability ULB4 load balancer, and shares the tools and lessons learned for future debugging.
DPDKhigh availabilityload balancing
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