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sounds like your guests are over provisioned; shouldn't need that many cores<br />
for rds, i wouldn't give more than 4 cores. &nbsp;10 is just overkill.
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Hi<br />
<br />
1. Check cpu usage on vm's, not on the host. If they are below 90% constantly you have perfect cpu settings.<br />
2. Yes you can, when the vm's really overuse the capacity hyper-v Will devide the resources.<br />
<br />
You have 28 cores, it is not uncommon to give the vm's 50-60 vCpu's.<br />
<br />
Nice to live in virtual computing!<br />
<br />
Cheers
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Performance counters gave 6 core a better rating for our RDS servers. We have about 10 people per server.
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Best indication is user experience, just ask your users and add vCpu until they are satisfied.<br />
Hyper-v has your back! :)
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Are my VMs underpowered?<br />
<br />
What is the performance like how many concurrent users do you have or want to have on the VMs?<br />
<br />
What is user experience like?<br />
<br />
Just adding g random amounts of vCPU may not give you the results you desire.
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We have about 10-13 user per server, user experience lag. I think adding more RDS servers might help with this. I'm just worried I will over extend my resources on the host.
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Did you add more vCpu to the servers?<br />
<br />
Again! Dont think 24 cores means you can only hand-out 24 vCores, it is the number one mistake admins make in virtualisation.
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I have a Server 2012 R2 Data Center running Hyper-V. The hardware on the host is 2x 2.6 GHz CPU (28 cores) and 384 GB of RAM. I host 15 virtual machines running Server 2012 R2 STD and Server 2008 R2 (RDS). Right now I give 4-10 cores per VM. <br />
<br />
1. Are my VMs under powered? (CPU usage on the host is always 1-8%)<br />
2. Can I give each VM 10 cores each, more than the cores I have?
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I have a Server 2012 R2 Data Center running Hyper-V. The hardware on the host is 2x 2.6 GHz CPU (28 cores) and 384 GB of RAM. I host 15 virtual machines running Server 2012 R2 STD and Server 2008 R2 (RDS). Right now I give 4-10 cores per VM. 

1. Are my VMs under powered? (CPU usage on the host is always 1-8%)
2. Can I give each VM 10 cores each, more than the cores I have?

local resources on a virtual host

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

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

virtual host

Hyper-V is a native hypervisor; it can create virtual machines on x86-64 systems and supersedes Windows Virtual PC as the hardware virtualization component of the client editions of Windows NT. A server computer running Hyper-V can be configured to expose individual virtual machines to one or more networks. Hyper-V Server supports remote access via Remote Desktop Connection. Administration and configuration of the host OS and the guest virtual machines is generally done over the network.