In network virtualization, a single root input/output virtualization or SR-IOV is a network interface that allows the isolation of the PCI Express resources for manageability and performance reasons. A single physical PCI Express can be shared on a virtual environment using the SR-IOV specification[1]. The SR-IOV offers different virtual functions to different virtual components (e.g. network adapter) on a physical server machine. The SR-IOV allows different virtual machines (VMs) in a virtual environment to share a single PCI Express hardware interface. In contrast, MR-IOV allows I/O PCI Express to share resources among different VMs on different physical machines.
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