Which factor is more important when selecting processor resources for a virtualization host?

Which factor is more important when selecting processor resources for a virtualization host?

• A. CPU speed is more important than cores and cache.
• B. CPU cores and cache are more important than CPUs.
• C. CPU speed and cores are equally important.
• D. CPU cores and cache are more important than CPU speed.

Answer: (B)

For virtualization hosts, the ability to run multiple virtual machines efficiently comes from parallel processing power and data locality, which means prioritizing CPU cores and the CPU cache over raw clock speed. When the hypervisor schedules vCPUs across physical cores, having more cores lets more VMs run concurrently without bottlenecking on a single processor. A larger or more effective cache (L2/L3) helps keep frequently used data close to the cores, reducing memory access latency across many VMs and lowering cache misses that can throttle performance under concurrent workloads. CPU speed still matters because faster cores improve any single-threaded or lightweight workloads, but in a host running several VMs, raw speed on a single core isn’t as impactful as having enough cores to distribute the workload and enough cache to minimize memory latency. So, more cores and better cache typically yield better overall virtualization performance than faster, fewer cores.

For virtualization hosts, the ability to run multiple virtual machines efficiently comes from parallel processing power and data locality, which means prioritizing CPU cores and the CPU cache over raw clock speed. When the hypervisor schedules vCPUs across physical cores, having more cores lets more VMs run concurrently without bottlenecking on a single processor. A larger or more effective cache (L2/L3) helps keep frequently used data close to the cores, reducing memory access latency across many VMs and lowering cache misses that can throttle performance under concurrent workloads.

CPU speed still matters because faster cores improve any single-threaded or lightweight workloads, but in a host running several VMs, raw speed on a single core isn’t as impactful as having enough cores to distribute the workload and enough cache to minimize memory latency. So, more cores and better cache typically yield better overall virtualization performance than faster, fewer cores.