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From David Mabry <>
Subject Re: Slow Networking
Date Wed, 26 Oct 2016 19:22:23 GMT

Did you download the latest windows virtio drivers that are signed by Redhat/Fedora?  If not,
you can find the latest stable ISOs at the following link:

Once you get the ISO downloaded, install the drivers, shutdown the VM, change the VM’s OS
Type to be Windows PV and finally start the VM.  Windows will take a moment during this first
boot to reconfigure its hardware and any reboots after this initial one should be faster.

Also, you can verify the drivers being used in Device Manager.  Look for devices that say
RedHat Virtio, or something similar to that.

I hope that helps.

David Mabry

From: Dustin Wright <>
Sent: Wednesday, October 26, 2016 8:16 AM
Subject: Re: Slow Networking

I don't work in Windows much so I might just be doing it wrong. I tried to run drvload.exe
each inf file. No luck. Is there a better way to install the drivers so Windows will pick
up and change?


Sent from my iPhone

> On Oct 26, 2016, at 9:04 AM, Simon Weller <> wrote:
> Dustin,
> So just to clarify here, if you install the virtIO drivers while in non PV mode and then
switching the template to Windows PV doesn't fix the problem?
> - Si
> ________________________________
> From: Dustin Wright <>
> Sent: Tuesday, October 25, 2016 9:44 PM
> To:
> Subject: Slow Networking
> Users,
> I am facing a problem with one client running a VPC on my HVM-backed
> CloudStack 4.5.2. The machines behind the VR get poor ping times and slow
> transfers. I think the issue is the Intel network adapter driver...
> Typically I setup Windows VM's with Windows PV as the OS type and add the
> drivers in myself. That did not happen and now they have a production
> environment running the generic Intel driver.
> Anyone know how to get a standard instance setup /w the additional drivers
> so I can switch it over to Windows PV OS type? I think using the Red Hat
> VirtIO drivers will help resolve the problem.
> Any suggestions for converting a Windows instance to Windows PV? If I just
> switch the OS will not boot...
> Any known issues with the VPC VR and general slowness? I see between 50M ~
> 100M max throughput and really wild latency between 10ms -> 200ms across
> the 1000mbits data center LAN. Would the default Intel driver explain some
> of these troubles?
> Thanks in advance for any guidance you can provide,
> Dustin
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