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Kubernetes Myth #11: CPU Requests Guarantee Reserved CPU
❌ Myth: If I set cpu: 500m in my pod’s requests, Kubernetes reserves 0.5 CPU exclusively for my pod. ✅ Reality: Kubernetes does not reserve CPU like it does for memory. CPU is a compressible resource, meaning: Your pod gets priority access to 500m CPU but can use more if available. Other pods can borrow unused CPU from your pod if it's not using the full 500m. If the node is under high load, the kernel’s CPU throttling kicks in, limiting your pod’s CPU usage.
❌ Myth: If I set cpu: 500m in my pod’s requests, Kubernetes reserves 0.5 CPU exclusively for my pod.
✅ Reality: Kubernetes does not reserve CPU like it does for memory. CPU is a compressible resource, meaning:
Your pod gets priority access to 500m CPU but can use more if available.
Other pods can borrow unused CPU from your pod if it's not using the full 500m.
If the node is under high load, the kernel’s CPU throttling kicks in, limiting your pod’s CPU usage.
