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Graphics cards

Phyllome leverages 3D acceleration within guest operating systems extensively, in three different modes depending on the situation.

  • vfio-pci : Passing through a complete physical Graphical Processing Unit (GPU) to the guest via the vfio-pci driver
  • vfio-mdev : Sharing a fraction of a compatible physical GPU such as those using single-root input/output virtualization (SR-IOV), via the vfio-mdev driver
  • vfio-gpu : Using some capabilities of the host GPU, via the vfio-gpu driver, which creates a virtual GPU as is used in Chromium OS and Spectrum OS
Description vfio-pci vfio-mdev vfio-gpu
Performance Near-native performance and full features set Near-native performance and full features set Degraded performance and limited features set
Guests support UNIX and non-UNIX guests UNIX and non-UNIX guests Works only on selected UNIX guests
Driver No special driver in the guest No special driver in the guest Requires a special driver in the guest
Number of host GPUs Two GPUs in most situations A single GPU A single GPU
GPU support Mostly GPU agnostic Recent Intel integrated GPUs and some professional grade Nvidia GPUs Mostly GPU agnostic