[vfio-users] VMs slow to a crawl with physical hardware attached

[Will Marler]

What's your host OS/kernel version/etc ?

On Tue, Jan 19, 2016 at 8:59 AM, Curlen M <curl2k1 at gmail.com> wrote:

> For the past month, I've been trying to get passthrough to work smoothly.
> Needless to say, I haven't been successful.  I've tried various distros,
> and even rebuilt/upgraded my rig from Z97 to X99 (tbh, I've been wanting to
> do that anyway  :-D) thinking things would go smoother.  No dice.  Here's
> what I'm currently using:
>
> ASRock X99 Professional (the Gigabyte and Asus I had before these were
> worse)
> i7 5820k
> 32GB RAM
> Lots-o-drives
> 660Ti
> 680
> Fury X
>
> The setup has both VT-x and VT-d enabled and is booting with the CSM
> disabled.  All 3 GPUs are starting in UEFI GOP mode.
>
>
> The initial plan was to use the 660Ti for the host and assign vfio to the
> 680 for a SteamOS instance and the Fury for a W10 instance.  Haven't had
> any issues assigning these.  So I'm good here.
>
> I'm able to build the VMs using Virt-Manager and get the OS installed.
> But as soon as I shutdown the VM and assign a video card to either VM and
> start it up.  CPU utilization on the host shoots through the roof and the
> OS slows to a crawl (noticed this by starting top on accident).  I'm
> talking an hour or more to get to the windows 10 desktop.
>
> I've tried many different configurations (including Seabios and Gerd's
> OVMF).  Including removing the Fury from the system and attempting to use
> the 680 in W10 and vice versa.  I've tried ditching Virt-Manager and
> libvirtd and using Qemu start scripts.
>
>
> I've since dropped the 660Ti out of the mix and have been attempting to
> use the 680 as the host with the Fury for W10.  Same results.
>
>
> Anyone have any tips?  Ideas?  Anything?
>
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>
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