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Hyper-V slow network performance

Running Windows 2012 server with a VM under Hyper-V also running a copy of Hyper-V.  I've noticed that copying files to the VM takes an awful long time, just copying 400 megs took a few minutes.  Copying to the host is fine.  Are there any settings on the VM adapter that needs to be modified to allow faster performance.  Presently only one nic with it being shared by VM and host.

Any suggestions are appreciated

Paul
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Peterson50
Asked:
Peterson50
2 Solutions
 
Cliff GaliherCommented:
What's your disk subsystem like? You have to consider where the VMs are and where you copied files to on the host in order to do apples to apples comparisons.
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Peterson50Author Commented:
Boot system is an SSD.  Data drives are two 1 TB drives with Raid 1 for redundancy.  There is basically 850 gigs out of 930 available, quite a bit of space.  When utilizing the virtualized windows 2012 directly in a window, the speed is excellent running programs and installing stuff, only when copying files from a workstation to the vm.  Broadcom mic
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Peterson50Author Commented:
The VM is running on the data drives but again when doing anything directly on the VM, AD stuff, installing software running sql it is fast, only when copying file to it from a workstation
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Cliff GaliherCommented:
Yokes. So now a workstation is involved too? Yeah, there are a lot of possibilities. I'd start by turning on some performance counters and verifying where the bottleneck is occurring.
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Peterson50Author Commented:
Are there any settings on VM virtual adapter that need to be tweaked?
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Cliff GaliherCommented:
Not usually. The so-called host is just a specialized VM that lets you manage the hypervisor. From the network stack, it is the same as every other VM.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
If I read that first part right the VM is also running the Hyper-V Role?

Philip
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Shabarinath RamadasanInfrastructure Specialist - MicrosoftCommented:
Does the VM has latest integration components installed?
What kind of vNIC you are using - Legacy or Synthetic?
How about the up-link interface used for the Virtual Switch in they Hyper-V server? We need to check the bandwidth ( 1GB/s or 10 GB/s or.. ) and how much its utilized over all.

Apart from these, the DISK plays a major role on the performance. How many VMs you have in this server?
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gmbaxterCommented:
As the others have mentioned, disk contention could be the issue here.

Also worth disabling TCP and UDP offloading on the VMs and physical hosts. I've seen it cause wierd issues with Broadcom NICs. Its under the NIC advanced settings.
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