[vfio-users] threadripper slowness

[Roger Lawhorn]

Hello,

Just wanted to mention that I got rid of a lot of the lag by compiling 
qemu 4.0.
I dod not know if its a threadripper issue or not.
The lag directly coincides with hard drive access.
No hard drive access, no game lag.
I have redhat virtio drivers installed for the hard drive and the nic.
Are these drivers intel only?
They are left only from my i7-4940mx processor install.


On 8/9/19 11:51 AM, Roger Lawhorn wrote:
> Hello.
> I am new to the list.
> I have been doing gpu passthrough for almost 5 years now with a i7 
> 4940mx cpu on a msi gt70 laptop.
>
> My new PC build is:
> MSI x399 carbon pro motherboard : bios xxxxxx.1c0 : svm=enabled: 
> iommu=enabled
> Threadripper 2920 12 core
> Radeon pro duo R9 Fury X
> Nvidia 980 TI OC
>
> I was unable to passthrough the nvidia card due to it not getting past 
> the "Running option rom..." message when debugging.
>
> The Radeon passed through with flying colors.
>
> The issue:
> I used the radeon to run triple A games in linux using steam for linux 
> and proton. No problems.
>
> In Windows 7 in qemu I have passed all 24 cpus to it.
> They max out to 80% while playing the same triple A games and the 
> games lag.
> I have never had this issue before.
>
> Admittedly I am using the same script I used on the i7 to get going.
> I had to remove threads from the -smp switch and use cores only.
>
> I also removed the kvm=off which is used for nvidia cards.
>
> I am looking for links to articles or direct info on what to do to 
> optimize the cpus.
> When not lagging the radeon performs extremely well.
>
> I am concerned that perhaps kvm is not being used.
>
>
> Thanks
>
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