Reducing Amazon EKS Compute Costs by 35%: Migrating Production Workloads from Graviton3 to Graviton4

Halodoc migrated their Amazon EKS workloads from Graviton3 to Graviton4 processors, achieving 35% cost savings through a data-driven approach. The migration involved two-phase validation: hardware benchmarking with Sysbench showed 28% CPU throughput improvement and 64% memory bandwidth gains, while application-level testing with JMeter demonstrated lower latency and resource utilization. By combining the processor upgrade with strategic resource right-sizing (15% CPU and 10% memory reduction), they reduced node count by 40% and maintained performance while cutting costs. The zero-downtime migration used controlled node pool rebalancing, followed by a one-week stabilization period before applying resource optimizations.