What is the average Windows 8.1 Virtual Machine memory usage at idle on Hyper-V 2012 R2?

Hello, I was just watching a presentation where the spokesperson is stating that Windows VMs (8.1 I assume) on a Hyper-V host with Dynamic Memory enabled can possibly use as little as 300 MB of RAM when idle.
My 8.1 Enterprise VM's with Dynamic Memory enabled still use about 2600 MB of RAM when sitting idle. Is this normal? It would be great to get this usage down. I hear rumors of 'MinWin' but don't think this really relates to a VDI deployment.
Also, I have configured 8 GB for startup RAM if that matters.
Thanks
- Mr. Sid
- Mr. Sid

Amount of memory is very dependent upon workload on the system. If nothing else on the Hyper-V host is asking for memory, the VM will not simply give it up. If you have plenty of RAM on your host, and the total amount of memory needed by all
the VMs and the host is less than the amount of RAM on the host, you will not likely see any decrease in the size of the VMs. With dynamic memory, if there is less physical memory than the sum of all the running VMs, one VM may need memory so it asks
for it. This might cause the memory manager to request to take the memory away from another VM. That VM looks at what it has allocated and determines what it can give up. Without this 'external' pressure, there is no need for the VM to give
up memory. In concept, this is no different than what happens among processes on a stand-alone system, except that when a process exits, it releases its memory. So, if the VM is sitting idle, that means processes are not exiting, so no memory is
being freed. It there were other machines needing the memory, it is possible that the idle VM could give up memory to those VMs needing more memory.
8GB for startup memory seems really excessive for a Window 8.1 installation. I can't think of any sort of typical workstation application that would require that much memory to start up. But, that makes no difference on freeing memory.
.:|:.:|:. tim

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