![]() ![]() ![]() Therefore, it might use the other Mellanox driver. If a VM is stopped/deallocated and then restarted, it might be redeployed on hardware with a different model of Mellanox physical NIC. With no customer option to specify which physical NIC that a VM deployment uses, the VMs must include both drivers. Placement of the VM on an Azure host is controlled by the Azure infrastructure. Because of the direct access to the hardware, network latency is lower and less CPU time is used to process network packets when compared with the synthetic interface.ĭifferent Azure hosts use different models of Mellanox physical NIC, so Linux automatically determines whether to use the “mlx4” or “mlx5” driver. Most network packets go directly between the Linux guest and the physical NIC without traversing the virtual switch or any other software that runs on the host. The VF interface shows up in the Linux guest as a PCI device, and uses the Mellanox “mlx4” or “mlx5” driver in Linux, since Azure hosts use physical NICs from Mellanox. The second interface is an SR-IOV Virtual Function (VF) offered by the physical network NIC in the Azure host. ![]() If the VM is configured with Accelerated Networking, a second network interface is created for each virtual NIC that is configured. Network packets that use this synthetic interface flow through the virtual switch in the Azure host and onto the datacenter physical network. The synthetic interface is a VMbus device and uses the “netvsc” driver. When a VM is created in Azure, a synthetic network interface is created for each virtual NIC in its configuration. How Accelerated Networking works in Linux and FreeBSD VMs ![]()
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