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

[Curlen M]

Current install is Arch with kernel 4.3.3

On Tue, Jan 19, 2016 at 11:11 AM Will Marler <will at wmarler.com> wrote:

> 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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