We experienced this issue recently as well. The Virtual Machine Queues (VMQ) feature seems to have some issues with Broadcom NICs. On all of the physical adapters, in the adapter configuration, disable the Virtual Machine Queues feature. It is in the Advanced tab. That took us from huge latency spikes back to solid, sub 1ms latency.
From: [email protected] [mailto:[email protected]] On Behalf Of Jim Majorowicz Sent: Wednesday, December 4, 2013 4:44 PM To: [email protected] Subject: Re: [NTSysADM] Possible Network issue with 2012 R2 Hyper-V Jim, I'll take a look at those settings here tomorrow. What I figured out this afternoon is that is something to do with the Virtual Switch or NIC on the VM itself. Connectivity to the Host PC which uses the IP assigned to the Hyper-V Virtual Switch works just fine, but a PING to the VM will regularly come back with times in the hundreds of MS rather than 1 or less. On Wed, Dec 4, 2013 at 1:00 PM, Kennedy, Jim <[email protected]<mailto:[email protected]>> wrote: I had similar issues with one of our 2012 hyper-v servers. The other is always fine and the 208 R2 ones are always fine. Some of the NICs would flip to 'unknown' networks. This certainly caused disconnects. I hit the below with gpedit and force it to private. Computer Configuration | Windows Settings | Security Setting | Network List Manager Policies From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Jim Majorowicz Sent: Wednesday, December 4, 2013 3:54 PM To: [email protected]<mailto:[email protected]> Subject: [NTSysADM] Possible Network issue with 2012 R2 Hyper-V I just installed a new server with a client and they appear to be experiencing some Network Latency issues as in files take seconds to open, the PC will frequently kick themselves into "Offline" mode, and there are so many components in play I'm little hesitant as to even know where to start, so if you all can help point me in the right direction.... New Server: Dell PE T320 2 x Broadcom NetXtreme Gigabit NICs (Onboard) Set in a Team. Virtual Ethernet Adaptor Switch configured with static IP used to connect to Host box. Connected Switch: (I do not manage this switch, and the company that does will no longer support.) Sprint 6124SX3 (connected to two ports) Fibre to two other Sprint switches in another part of the building. All of this will be replaced when the new Phone system is put in. The PCs are all connected to the network *THROUGH* the added port on the Shoretel VoIP phone. Nothing with the phone system has been updated in over 5 years. I used the Windows 2012 R2 Hyper-V Best Practices Checklist from the blog to setup the server and pretty much just went with the default settings. Internet is a slow antiquated partial T1, soon to be replaced. How do I figure out what is causing the access lag? ________________________________ Kern Health Systems Confidentiality Statement: This email and any attachments are legally privileged and can contain business proprietary and/or confidential information intended for a specific individual and purpose. This information is intended only for the use of the individual or entity named above. The authorized recipient of this information is prohibited from disclosing this information to any other party unless required to do so by law or regulation and is required to destroy the information after its stated need has been fulfilled. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or action taken in reliance on the contents of these documents is strictly prohibited. If you have received this information in error, please notify the sender immediately and arrange for the return or destruction of these documents.
