Isolate processor core

Is it possible to dedicate a heart of processor together for a virtual machine?  With the processor affinity, I will devote a virtual machine at the heart of a processor.  This virtual machine running only with the heart that he has an affinity with.  However, other virtual machines can always run on this core.  How can I insulate a whole CPU core to be used by a single virtual computer?  The other processor cores should be free of any of a large number of virtual machines - run using Affinity processor for all the virtual machines so that a VM can have its own core is not an option.  I just need to dedicate a carrot to a vm, and keep the other each vm to access.

(Note: this is all terrible design and not best practices that I realize - it is independent of my will to tell how to do but be aware if it is theoretically possible)

Thanks for the input

You are right. But remember that each vCPU is programmed according to the CPU scheduler.

This means that:

  • 1 vCPU by pCPU
  • Timeslicing for the principle of equity, even if you isolate a Jepp. so a vCPU is going to be tended if it reaches the end of its timeslice, because no other vCPU run on the Jepp this will be scheduled immediately.
  • Other worlds, BHs and interruptions of must be published too, so assign a second Jepp to eliminate vCPU and competition for the time of the worlds.
  • The VMkernel uses all pCPUs available for the planning of its process, it does not take into account a virtual machine with the processor affinity.

Tip:

  • If you are running on a NUMA node, set the affinity of the memory to avoid distant memory.
  • "Off to assign" the Jepp second on all other VMS as well, because the CPU scheduler can (more to the difference, but there is no guarantee) migrate the vCPU thread to the other processor for balancing purposes.

Frank Denneman

Co-author of: vSphere 4.1 HA and DRS technical Deepdive - now on Amazon

Tags: VMware

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