Speed Up Downloads On Hyper-v
This is an odd one. Hyper-V 2012 Server installed as the base OS. This is just the hyper-visor, not the full blown Windows Server 2012 Standard. Hardware is a poweredge r520, 16gb ram, Gigabit nic.Running a Windows 7 Pro guest VM. 4gb ram, two cores of the processor.File transfers between hyper-v base OS and guest run normal.File transfers between any of our file servers and the hyper-v base OS run normal. Robocopy reports about 2000 megabytes per minute. Ping times show.
Few Hyper-V topics burn up the Internet quite like “performance”. No matter how fast it goes, we always want it to go faster. If you search even a little, you’ll find many articles with long lists of ways to improve Hyper-V’s performance.
Couldn't call it a night just yet. Based on more google searches it's definitely related to VMQ and the broadcom network adapters. I did have VMQ disabled on the VM but apparently that is not enough.
It has to be disabled on the host as well. It appears there is a driver update available from broadcom for some network adapters that has VMQ automatically disabled, so that's probably what fixed syko24 as he mentioned in his post. I've tried two different drivers from broadcom and the problem only got worse. So that did not help me.I googled some more and came across a post that said they went into device manager and disabled VMQ under the advanced tab on the nics.
Hyper-v core doesn't have device manager. But you can disable it via powershell. I ran this command to get the names of my nics. Autotuning didn't make a difference.
Vlan identification was already disabled on the guest's NIC.I updated the drivers to the newest ones on Dell's site. After it rebooted the ping times were now consistent, but file transfer speed to the VM was still slow.
Unfortunately this also slowed down the transfer times to the host as well. So that was a bit disappointing.:)At the moment I've just completed a scratch install of Hyper-V and will be creating a brand new VM to test with again. I will report back on what happens. Thanks for the update, Jason. I'm interested in your findings because I have a similar problem with a couple of production Hyper-V hosts. Over the last year I have duplicated tests similar to yours and have also - at some point or another over the last year - followed all of the suggestions in this thread to no avail. The performance is 'good enough' for now considering they were in production when I got here, so I've not dug in much deeper yet.
I have a new host & SAN in next year's budget too so I'm planning to test this issue thoroughly on it before deploying. Hopefully you stumble onto something I haven't though.Keep us posted!
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Will do.So fresh install of Hyper-v 2012. Copying from file servers to the host drive happens at normal speed. Created a brand new VM of Windows 7, installed the integration services (updated I should say), copy speed from the file servers is slow.I run a constant ping from the VM (Quicktest in the pic below) to a fileserver, ms are fine until I start copying a file. Then they go up to 50-150 or higher at times.Now if I start a large file transfer on the host (172.17.17.93 in the pic below) and THEN run the exact same file copy on the VM (Quicktest) the copy procedure runs like normal, ping times stay normal, works as expected.The server has two NICs and I've tried attaching the VM to both. I've swapped patch cables, even plugged into different ports on the switch. But to me based on these tests the problem is somewhere in the hyper-v OS. Because obviously full speeds CAN be achieved, it's right there in the screenshots.It's like I'd need to run some kind of constant network traffic on the host in order to get full network speed on the VMs.
Surely there is a fix for this?I'm not giving up, but I might be giving up until the weekend is come and gone. Unless someone else comes up with a suggestion.:). Couldn't call it a night just yet. Based on more google searches it's definitely related to VMQ and the broadcom network adapters. I did have VMQ disabled on the VM but apparently that is not enough.
It has to be disabled on the host as well. It appears there is a driver update available from broadcom for some network adapters that has VMQ automatically disabled, so that's probably what fixed syko24 as he mentioned in his post. I've tried two different drivers from broadcom and the problem only got worse. So that did not help me.I googled some more and came across a post that said they went into device manager and disabled VMQ under the advanced tab on the nics.
Hyper-v core doesn't have device manager. But you can disable it via powershell. I ran this command to get the names of my nics.
Speed Up Downloads On Hyper-v Windows 7
I believe I have the same situation. Win 10 Pro (1709 build 16299.19)+ Hyper-V the Host and VMs are extremely slow. NIC is a Realtek RTL8188EU Wireless. The problem doesn't seem to be related to a specific NIC card since there are reports here with differentnetwork cards.Edit: So I just uninstalled Hyper-V and reinstalled it.
Speed Up Downloads Windows 7
Looks like everything went to normal. And the best thing is that my VMs are still there, the only thing I had to do after the reinstallation was to configure a new Virtual Switch and reassign themin each VM. HiJust wanted to say I just had the exact same issue. This was a cleanly installed Lenovo T470p with the Intel I219-V, Running the latest drivers on Windows 10 1709. As soon as I enabled vSwitching on the NIC, internet speed became extremely sluggish.
Speedtestwas around 0.5Mbps/60mbps. The funny part is that the VM that is attached to this vSwitch was running perfectly fine.When dissolving the vSwitch, my download speeds were normal 400/60mbps. I looked around on google, and found a few people suggesting to remove the Intel Management Engine components, and that resolved the issue.
Hyper-v Server
Just FYI, if anyone else bumps into this problem.