Server 2012 r2 Hyper-v guest network speed with 10 GB NIC's

Hi
Setting up a Server 2012 r2 Hyper-v host with an onboard 4 port 1 GB nic and a offboard dual port 10 GB nic. We are using the 1gb quad port for management. The 10 Gb we intend using for hyper-v guest use however we don't seem to be able to achieve very high
speeds though the 10 GB adapter when assigned to a virtual switch. Testing the 10 Gb nic from the host confirms that we can transfer/get 10 GB speeds. When assigned to a virtual switch however the speed drops to about 1-2 Gbps. Has anybody seen anything like
this ?. We've tried a variety of settings and i can confirm that the network traffic is using the 10 GB nic.

Hi,
I am almost certain what you see is by design. I don't want to go into to much detail because I'm in a bit of a hurry. But allow me to explain.
Suppose you have a 10Gb NIC interface and an multi-core CPU. When you have RSS (Receive-Side Scaling) disabled a single core can normally handing
around 2.5-4.3Gbps. When you enable RSS the data streams/traffic is spread across multiple cores.
But RSS is a network optimization feature for the Management OS, not for a vSwitch. Instead you should use VMQ (Virtual Machine Queuing). VMQ is
the equilavant of RSS, but then intended for VMs. But... there is a difference. VMQ does not spread single data streams/traffic across multiple cores. Instead is (dynamically) assigns each vmNIC its own core. So... you don't use multiple-cores at a time for
a single vmNIC. You can't use RSS and VMQ at the same time. Keep that in mind.
But... you can accomplish this by enabling vRSS as well. That's another story.
If you watch the following video, at the end you know all about VMQ.
Hyper-V dVMQ
http://www.hypervrockstar.com/tag/dvmq/
Boudewijn Plomp | BPMi Infrastructure & Security
This posting is provided "AS IS" with no warranties, and confers no rights. Please remember, if you see a post that helped you please click "Vote as Helpful", and if it answered your question, please click "Mark as Answer".

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Blog:
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Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

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Elton Ji
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If it is not the answer , please unmark it
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

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CSV storage where the VM is located and not on the local host somewhere like C:\program data\.... that is stopping it being migrated to the new host when the VM is live migrated.
Kind Regards
Michael Coutanche
Blog:
Twitter: LinkedIn:
Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

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Hi epenx,
Thanks for the information .
Best Regards,
Elton Ji
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are trying to better understand customer views on social support experience, so your participation in this
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Hi Andrey ,
First , I would suggest you to keep the driver up-to-date for physical NIC .
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http://blog.nicholasrogoff.com/2010/09/24/windows-2008-r2-hyper-vguests-vms-have-slow-performance-change-you-adapter-settings/
Best Regards
Elton JI
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.
Hi Elton!
I have already installed
the latest driver for NICs. From here:
Broadcom
The integration service was installed of course.
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freezes
when copying. Load is 100%..
Disabling"offload"
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