High Latency on Hyper-V server

Hello all,

I am seeing high latency tracert from a VM. over 150ms up to about 200ms. Tracing to a PC on the same network.

The topology is one Cisco 3650 Switch and of course the Hyper-V server, Dell R730. I have tried chimmey off load, Turning off VMQ, Isolating network interfaces, no matter what can not get the ping to go down.

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I have seen this issue on some Dell servers when both the host and virtual machine are allowed to use the virtual NIC. To ensure this is not the issue allow only one or the other to use the NIC and see if this clears up the issue (has for me on certain models)

Also - update the drivers. If you can update them from the manufacturer instead of Dell. (Broadcom, Intel, etc.)

It was related to a feature of the NIC that is not highly advertised - If this worked for you I will check my notes when I get home to see if I can track down the name of the feature so you can research which NICs may be affected.
SearsFranchisesITAuthor Commented:
thanks for the response. Here's my retort. :) I have 24 ports in these servers, all use LACP for different networks. This network that is causing issues is a etherchannel using 2 ports on a 4 port card. The other 2 ports are fine, the driver was updated to the latest tonight, thanks for the advice, :)

I am not real clear on your first comment, in looking at the config it does not look like the host is using the virtual nic?

Thanks in advance for any additional assistance.

Philip ElderTechnical Architect - HA/Compute/StorageCommented:
How are the ports teamed? Natively or via the vendor's tools?
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SearsFranchisesITAuthor Commented:
Native though Windows 2012 R2 LACP with Cisco Switches at the other end.

I may have found the issue, that being VMQ enabled on the physical interfaces. I will report if that was the fix.


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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Broadcom NICs. They're bad. They are supposed to disable VMQ on Gigabit NICs by default.

NOTE: If the driver gets updated those settings may get reset. Verify them after!

EDIT: Also, in 2012 R2 the preferred native teaming method is the Default. LACP can introduce headaches.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
You can close as per your assigned points without intervention. :)
SearsFranchisesITAuthor Commented:
Offloads need to be shut off  as well as VMQ
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