Hi, hope someone can explain this to me
Can I overprovisioning CPU usage in Hyper-V 2012 R2 as described in this article below? When I previously used ESX I hade the problem and reduced the number of vCPU in the VM's.
Does it work the same way in Hyper-V?
I have a server with 12 cores, 24 logical processors. Should the total amount of vCPU on all VM's not exceed 24 for best performance?
http://www.zdnet.com/virtual-cpus-the-overprovisioning-penalty-of-vcpu-to-pcpu-ratios-4010025185/
"To explain this further let’s take an example of a four pCPU host that has four VMs, three with 1 vCPU and one with 4 vCPUs. At best only the three single vCPU VMs can be scheduled concurrently. In such an instance the 4 vCPU VM would have to wait for all four pCPUs to be idle. In this example the excess vCPUs actually impose scheduling constraints and consequently degrade the VM’s overall performance, typically indicated by low CPU utilization but a high CPU Ready figure. With the ESX server scheduling and prioritising workloads according to what it deems most efficient to run, the consequence is that smaller VMs will tend to run on the pCPUs more frequently than the larger overprovisioned ones. So in this instance overprovisioning was in fact proving to be detrimental to performance as opposed to beneficial. Now in more recent versions of vSphere the scheduling of different vCPUs and de-scheduling of idle vCPUs is not as contentious as it used to be. Despite this, the VMKernel still has to manage every vCPU, a complete waste if the VM’s application doesn’t use them!"