CPU Over Commitment and Scheduling on Oracle VM Server 3.x
(Doc ID 1640862.1)
Last updated on OCTOBER 31, 2019
Applies to:Oracle VM - Version 3.0.1 and later
Oracle Cloud Infrastructure - Version N/A and later
Discuss CPU Over Commitment and Scheduling on Oracle VM Server 3.x.
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In this Document
|Questions and Answers|
|1. Enable Intel Hyper-Threading? Or disable it?|
|2. Two common mis-understandings after Intel Hyper-Threading is enabled.|
|NUMA (Non-Uniform Memory Access)|
|1. Limit CPU scheduling on dom0 to logical CPUs in the first NUMA node.|
|2. Single VM guest should not be assigned with vCPUs more than the number of logical CPUs in one NUMA node.|
|3. CPU pinning on a VM guest within one NUMA node and avoid the first NUMA node.|
|4. Any VM guest is not NUMA-aware|
|5. Set CPU pining on VM guest before Live Migration|
|6. Performance tuning if dom0_max_vcpus is less than 8 (OVS 3.4.1 and later)|
|1. Prefer adjusting vCPUs assignment of a VM guest to editing CPU scheduler parameters (e.g. Weight, Cap.) of a VM guest.|
|2. Always keep dom0 with the only highest Weight.|