Single-root IO virtualization technology allows a virtual adapter to bypass the virtual switch software on the hyper-v host.
The PCI Express (PCIe) specification has been extended to include the single root I/O virtualization (SR-IOV) interface.
A device, such as a network adapter, can divide access to its resources across several PCIe hardware functions thanks to SR-IOV.
Network traffic can avoid the software switch layer of the Hyper-V virtualization stack owing to SR-IOV. The network traffic flows directly between the VF and child partition since the VF is associated with a child partition.
As a result, the software emulation layer's I/O cost is reduced and network performance is achieved that is almost on par with nonvirtualized situations.
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