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1 vCPU does not equal 1 core - there is no one to one relationship (at all) with any hypervisor (not with Hyper-V, nor XenServer, nor ESX)<br />
Let’s do the Hyper-V math... &nbsp;The capacity planning guideline is 8 vCPU per CPU Core.<br />
One CPU (dual core) = 2 Cores &nbsp; &nbsp; x8 = 16 virtual CPUs.<br />
16 vCPUs / 4 vCPU per VM = 4 VMs<br />
16 vCPUs / 2 vCPU per VM = 8 VMs<br />
16 vCPUs / 1 vCPU pre VM = 16 VMs<br />
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<a href="http://social.technet.microsoft.com/wiki/contents/articles/1234.hyper-v-concepts-vcpu.aspx" rel="ugc nofollow">http://social.technet.microsoft.com/wiki/contents/articles/1234.hyper-v-concepts-vcpu.aspx</a>
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1 vCPU does not equal 1 core - there is no one to one relationship (at all) with any hypervisor (not with Hyper-V, nor XenServer, nor ESX)
Let’s do the Hyper-V math...  The capacity planning guideline is 8 vCPU per CPU Core.
One CPU (dual core) = 2 Cores     x8 = 16 virtual CPUs.
16 vCPUs / 4 vCPU per VM = 4 VMs
16 vCPUs / 2 vCPU per VM = 8 VMs
16 vCPUs / 1 vCPU pre VM = 16 VMs


http://social.technet.microsoft.com/wiki/contents/articles/1234.hyper-v-concepts-vcpu.aspx [http://social.technet.microsoft.com/wiki/contents/articles/1234.hyper-v-concepts-vcpu.aspx]

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I have activated HyperV3.0 on windows 2012 server. I made a virtual machine, operating system is windows 2008 R2 SP1. Users connect via remote desktop and use applications. While on the guest server the CPU usage is 60%-80% &nbsp;host CPU usage does not exceed 5%. There are 2 CPUs, total of 8 core CPUs. Virtual machine sometimes experiences slow downs due to CPU usage. Right now I am using 4 VCPUs. How can I allocate more CPU to the guest machine? Does it have anything to do with NUMA settings?<br />
<br />
Thank you for your time.
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I have activated HyperV3.0 on windows 2012 server. I made a virtual machine, operating system is windows 2008 R2 SP1. Users connect via remote desktop and use applications. While on the guest server the CPU usage is 60%-80%  host CPU usage does not exceed 5%. There are 2 CPUs, total of 8 core CPUs. Virtual machine sometimes experiences slow downs due to CPU usage. Right now I am using 4 VCPUs. How can I allocate more CPU to the guest machine? Does it have anything to do with NUMA settings?

Thank you for your time.

CPU allocation to the guest machine on HyperV3.0

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.