360 Zhihui Cloud Developer

Jul 13, 2026 · Cloud Native

Redis Timeouts Traced to CPU Softirq Scheduling – Full End‑to‑End Investigation

An intermittent Redis timeout in a Kubernetes pod was traced not to Redis or the network but to uneven soft‑interrupt handling on a single CPU core, caused by irqbalance moving interrupts across NUMA nodes, and resolved by aligning NIC queues, adjusting irqbalance, and reserving CPUs.