[ovirt-users] Re: video virtio (instead of qxl)

[Michael Lipp]

Am 15.07.20 um 17:36 schrieb Michal Skrivanek:
>
>> On 14 Jul 2020, at 16:44, Michael Lipp  wrote:
>>
>> Am 14.07.20 um 15:27 schrieb Michal Skrivanek:
>>>> This works perfectly with my Fedora 32 and Arch guests and the change is 
>>>> really worth it.
>>> Hi,
>>> what kind of performance benefits you’ve seen? 
>>>
>>> It’s not currently in near term roadmap, but if anyone wants to contribute 
>>> patches I don’t see a problem including it as an option for newer guests 
>>> indeed.
>> The display (spice) updates much faster and more "smoothly". Most
>> notibly when using Arch VMs. With QXL, I have an extreme delay when
>> typing. This vanishes completey with virtio-vga.
> using which client? remote-viewer? on which platform?
> qxl needs drivers, not sure if Arch has that…it should have, but for Windows 
> you definitely need to install them. If they’re not all right it falls back 
> to vga emulation which is then slow indeed

Using ... interesting question. I always assumed that virt-manager
starts a viewer, but I cannot find one in my process list. So: using
virt-manager.

My Arch system has "xf86-video-qxl" installed and loads the "qxl" kernel
module automatically when the guest configuration is set to using QXL.
It does not automatically load "bochs_drm" as mentioned here
(https://wiki.archlinux.org/index.php/QEMU#qxl). However, adding it
"manually" doesn't make any difference.

I know about Windows. I'm using these guests with QXL and the windows
drivers installed (AFAIK there are no virtio-vga drivers for Windows).
Contrary to Arch, Windows+QXL works satisfactory.

 - Michael

>
>>  - Michael
>>
>>> Thanks,
>>> michal
>>>
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>>
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[ovirt-users] Re: video virtio (instead of qxl)

[Michael Lipp]

> Do you mean virtio-vga / virtio-gpu?

virtio-vga. To be specific (libvirt):


  

  
  


which results in:

-device virtio-vga,id=video0,virgl=off,max_outputs=1,bus=pci.0,addr=0x2

This works perfectly with my Fedora 32 and Arch guests and the change is really 
worth it.
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[ovirt-users] video virtio (instead of qxl)

[Michael Lipp]

Hi,

I've searched to no avail: is it possible to use video virtio (instead of qxl) 
in a VM managed by oVirt? I have much better performance with video virtio when 
testing this with "plain" libvirt.

I would have at least expected to find some feature request or something alike 
when searching. Does anybody know anything about this being on some ToDo list? 
Or has this really escaped everybody's notice?

 - Michael
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