Investigation of a Cross-regional Network Performance Issue
Netflix resolved a cross-regional network performance issue by identifying and fixing a problem caused by a recent Linux kernel upgrade.
MAIN POINTS
- Netflix's cloud infrastructure faced cross-region traffic timeouts due to a recent Linux kernel upgrade.
- The issue was traced to a kernel change affecting TCP receive window size, halving throughput.
- A kernel patch was applied to correct the scaling ratio, restoring normal operation.
TAKEAWAYS
- Cross-region network performance issues can stem from both network and software components.
- Accurate debugging requires thorough investigation across multiple infrastructure layers.
- Kernel updates can have significant impacts on network performance and require careful evaluation.