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Low framerate with dma-buf output #35
I have dma-buf working with GVT-g on kernel 4.16 and QEMU 2.12. The framerate of the framebuffer output is very low however (seems to be around ~20 fps). I've run the Heaven benchmark in the VM, and that seems to perform about as expected, so it's only the dma-buf output that's slow. Does anyone else experience this?
I'm using Libvirt with local SPICE and OpenGL. Also tried different Intel drivers in the VM, no difference.
pushed a commit
May 16, 2018
Same here, refresh rate of whole "dmabuffed" display is really bad via Spice or GTK. OpenGL / DirectX apps FPS seems OK. Tested on Windows 10 Enterprise 1803 Guest with latest 22.214.171.12494 Intel drivers, custom compiled Qemu 2.12.1 and 4.18.0 kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2018-08-03/ (using it because of another bug)... all on Ubuntu 18.04. Any help please?
When using spicy client conneced to local dmabuff VM try turning off spice protocol compression, refreshrate seems normal OK then!
qemu-system-x86_64 ... -spice disable-ticketing,port=5910,image-compression=off,streaming-video=off,playback-compression=off,jpeg-wan-compression=never,zlib-glz-wan-compression=never