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SubjectRe: Poor windows VFIO performance, GPU stalls (bisected)
On Sun, 26 Jul 2020 17:49:07 +1000
Geoffrey McRae <geoff@hostfission.com> wrote:

> Hi All,
>
> The commit 22540ca3d00d2990a4148a13b92209c3dc5422db causes a Windows KVM
> guest running under QEMU with a VFIO passthrough GPU to randomly stall
> when using the GPU leading to the guest assuming that the driver has
> hung. Reverting this commit resolves the problem.

Please double check this commit ID, I can't find it in mainline or
linux-next. Thanks,

Alex

> The host system is configured with the following kernel arguments which
> may be related:
> isolcpus=0-5,24-29,6-11,30-35 rcu_nocbs=0-5,24-29,6-11,30-35
>
> The system is an AMD Threadripper 2970WX on a Gigabyte x399 AORUS Gaming
> 7 board.
> It has two GPUs each being passed through to two separate KVM guests,
> one is an AMD Radeon 7 in a Linux guest, the other is a GeForce 1080Ti
> in a Windows guest.
> The cores used for these two guests are isolated from the host for
> performance reasons.
>
> Any insight as to why this is occurring would be appreciated. If you
> need any more information or would like to test patches please let me
> know.
>
> Kind Regards,
> Geoffrey McRae
> HostFission
>
> https://hostfission.com
>

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