On Tue, 19 May 2020, Marc-André Lureau wrote:
Hi,
Is virgl/OpenGL support through virt-manager supposed to work and perform
well?
I have the following:
Host OS: Fedora 32
Guest OS: Debian Unstable
In virt-manager, I have the following:
Display Spice
Type: Spice server
Listen type: None
Password: Blank
Keymap: Blank
OpenGL: Checked & /dev/dri/renderD128
Video Virtio
Model: Virtio
Ram: -
Heads: 1
3D acceleration: Checked
In the guest OS:
talbert@debian-unstable:~$ sudo dmesg | grep '\[drm\]'
[ 1.947975] [drm] pci: virtio-vga detected at 0000:00:01.0
[ 2.019988] [drm] features: +virgl +edid
[ 2.022522] [drm] number of scanouts: 1
[ 2.022529] [drm] number of cap sets: 2
[ 2.048982] [drm] cap set 0: id 1, max-version 1, max-size 308
[ 2.049125] [drm] cap set 1: id 2, max-version 2, max-size 688
[ 2.049332] [drm] Initialized virtio_gpu 0.1.0 0 for virtio0 on minor 0
So it *seems* like things are configured correctly? However, performance
is not great. Performance is much better if I switch back to QXL video.
It looks like your setup should be fine. What performance are you
running? Local or remote? If it's 2D based anyway, chances are you get
similar results with QXL or virtio, probably with better QXL results
with the QXL Xorg driver.
It's local. I don't have any quantitative data on performance, just my
observations on performance. In the guest, I'm just running the default
Debian DE (Gnome Shell) on Xorg. Wayland performs worse. Gnome Shell is
3D, right?
Yes. With virgl, make sure the virtio-gpu DRI driver is loaded (and
not the sw/llvmpipe). On Xorg, make sure glamor is running.
What's your host gpu?
It looks as if virtio-gpu and glamor are loaded/running:
talbert@debian-unstable:~$ grep virtio ~/.local/share/xorg/Xorg.0.log
[ 28.590] (II) modeset(0): [DRI2] DRI driver: virtio_gpu
[ 28.590] (II) modeset(0): [DRI2] VDPAU driver: virtio_gpu
[ 28.603] (II) AIGLX: Loaded and initialized virtio_gpu
talbert@debian-unstable:~$ grep glamor ~/.local/share/xorg/Xorg.0.log
[ 28.451] (II) Loading sub module "glamoregl"
[ 28.451] (II) LoadModule: "glamoregl"
[ 28.451] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[ 28.456] (II) Module glamoregl: vendor="X.Org Foundation"
[ 28.527] (II) modeset(0): glamor X acceleration enabled on virgl
[ 28.528] (II) modeset(0): glamor initialized
Host GPU is:
[talbert@deasil ~]$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Venus XTX [Radeon HD 8890M / R9 M275X/M375X] (rev 83)
One other note: there is some intermittent display corruption while the
guest OS is booting.
Thanks,
Scott
