Interrupts are the slowest part of VFIO, but everything else is comparable. The interrupt performance can and will be fixed in the future. Polling is an option

Interrupts are the slowest part of VFIO, but everything else is comparable. The interrupt performance can and will be fixed in the future. Polling is an option for some network uses, but interrupts are obviously technically superior for most workloads. The I/O MMU can be slightly slower than "true" DMA if done poorly, but the simple use case is actually performs the best (in my teeny experience).