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SR-IOV specification poses promise and pitfalls in virtualized networks

Submitted by on July 31, 2018 – 4:07 amNo Comment

SR-IOV is a peripheral component interconnect (PCI) standard that has important performance implications for virtual networking. The SR-IOV specification splits the network card of a host into physical and logical functions.

The physical function handles the link characteristics, while the virtual function presents a number of logical PCI interfaces the administrator can assign to guests. These virtual interfaces are logical — effectively dedicated — devices. This allows the network card to forward traffic directly to the correct virtual machine (VM), without requiring a virtual switch to duplicate a forwarding decision.

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