Oh, I forgot about the gtk and sdl displays... I'll test them together with QXL.
Thanks for your hint! But anyways, I'll need two X servers when using this setup - one on the VM and one on the hypervisor. Shouldn't X11 forwarding be less overhead? Thank you Ralf On 06/25/2015 05:44 AM, [email protected] wrote: > Ralf <[email protected]> wrote: > >> Hi out there, >> >> assume the following situation: >> >> I do have a minimalistic hypervisor running a minimalistic virtual >> machine (qemu with kvm, qxl and spice). >> Both systems, hypervisor and VM are able to run X servers and >> apllications. The graphics card of the hypervisor is connected to a >> monitor. This monitor only has to show one single standalone QT >> application which is running on the virtual machine. >> >> What will give me more video performance? >> >> 1. Running a minimalistic X server on the virtual machine showing the >> application AND running a minimalistic X server on the hypervisor >> running remote-viewer >> or >> 2. Running a minimalistic X server on the hypervisor and using >> X11-Forwarding via bridged ethernet >> >> Or maybe even someone knows a better solution? >> >> Thank you folks! >> >> Cheers >> Ralf > On my system, qemu-kvm has the best performance with X11 on guest. > I've also tested vnc and spice with qxl video driver on guest, but X11 > was faster. > > I can imagine that this depends on the hardware and screen resolution. > So maybe on your system an other setup is better. > > My host GPU is a Radeon Ultimate R7 250, resolution is 3840x2160@60Hz, > driver is xf86-video-ati. > X11 compositing is deactivated on host as well as on guest. > > As "video card" on guest I use vmware (-vga vmware). Screen resolution > on guest is 2386x1770. That seems to be the highest possible screen size > that is available with this settings. I also tested other guest video > drivers (std and cirrus) but vmware was the fastest and also the one with > the highest resolution. > > Before I bought an UHD monitor, I used sdl as qemu display (-display sdl) > in borderless fullscreen mode (-no-frame -full-screen). I used the same > screen resolution on host and guest (1920x1200) and qemu was running on > one of my virtual XFCE desktops. > This was very handy. But as I've written before, it seems not possible for > me to run qemu with UHD screen size. So fullscreen mode isn't possible any > longer and now qemu runs in a window on my desktop (-display gtk). > > But with none of my setups it was/is possible to run a fullscreen video > on the guest vm. Performance is much to slow for that. I've spent some > time to make it faster, but I failed. > > I would be happy for any hints about better video performance with qemu. > > -- > Regards > wabe >
