[vfio-users] Speed tips requested

[Nick S]

Do you pass your USB keyboard or do you use emulated keyboard and one of
QXL windows to grab/release focus? I use the second option and I had to
follow the steps from the following link to deal with performance proplems
with key repeats:
http://serverfault.com/questions/624690/windows-guest-on-kvm-qemu-suffers-horrible-key-lag

On Sat, Mar 25, 2017 at 10:51 AM, Patrick O'Callaghan <poc at usb.ve> wrote:

> I'm running Windows 10 in a KVM/QEMU VM under Fedora 25. The host is a
> 16GB i3770 and I have 4 threads (2 cores) dedicated to the VM with CPU
> pinning and 8GB hugepages. The passthrough GPU is an Nvidia Geforce GTX
> 1050.
>
> The guest disk is a 100GB raw file under vfio. The host disk is a 1TB
> Toshiba SATA 2.
>
> This generally works quite well, except for two things:
>
> 1) KB events seem to overrun in games, i.e. there is stuttering and a
> buzz when holding down a key for too long. Keyboard and mouse are
> wireless Logitech hardware on a USB-2 port.
>
> Initially I had configured USB-2 on the VM and in an effort to fix this
> changed it to USB-3, which seemed to make it slightly faster but not go
> away (nb: this is still on the same physical USB-2 port).
>
> I then attempted to enable MSI as outlined in https://vfio.blogspot.co.
> uk/2014/09/vfio-interrupts-and-how-to-coax-windows.html. After the USB-
> 3 change (see above) Windows now shows the USB-3 controller as using
> MSI, however the Windows Nvidia drivers don't seem to support it, even
> after registry editing. Note that the GPU hardware does support it
> according to Linux ('lspci -v -s <id>').
>
> 2) There is quite frequent (every few seconds) visual stuttering --
> pause then continue -- when moving rapidly through a rendered scene,
> possibly caused by disk I/O.
>
> I'm already using vfio. Would vfio-scsi make a difference? Should I be
> thinking about a dedicated disk?
>
> Thanks for any hints.
>
> poc
>
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