What Is The Enable single-root I/O virtualization (SR-IOV) Hyper-V Setting?

IT Support Forum Forums Virtualization Microsoft Hyper-V General Discussion What Is The Enable single-root I/O virtualization (SR-IOV) Hyper-V Setting?

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    What does Enable single-root I/O virtualization (SR-IOV) do in Hyper-V? Enable single-root I/O virtualization (SR-IOV) is a Hyper-V External Virtual Switch setting that offloads to the emulated hardware, instead of virtualising it in Hyper-V as a software device (not physical).

    There can be some performance advantages of enabling single-root I/O virtualization, but SR-IOV will probably make your network go slower because:

    • Emulated devices requires lots of Hypervisor intercepts for every single I/O
    • Operations can’t use shared memory access, which is faster
    • Emulated devices require operations that are based on the hardware emulated functionality, whilst software devices can be programmed based on the required functionality of the software and are therefore faster
    • There’s not need to transition through layers of the hypervisor to send commands with software devices, so conversely single-root I/O virtualization is slower

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