Performance Optimizations in VMware vSphere 7.0 U2 CPU Scheduler for AMD EPYC Processors

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March 24, 2021

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VMware vSphere 7.0 U2 includes a CPU scheduler that is architecturally optimized for AMD EPYC. This scheduler is designed to take advantage of the multiple last-level caches (LLCs) per CPU socket offered by the AMD EPYC processors. This paper shows that vSphere 7.0 U2 can achieve near optimal performance with this new CPU scheduler using out-of-the-box BIOS options and vSphere settings. An extensive performance evaluation using both enterprise benchmarks and microbenchmarks shows that the CPU scheduler in vSphere 7.0 U2 achieves up to 50% better performance than 7.0 U1.