VT-D Passthrough DDA Direct Device Attach I/O NIC Network Virtualization

To VT-D or Not to VT-D? A guide on whether to Utilize Direct Device Attach in your Virtualized System?

Intel VT-D Direct Device Attach allows a Virtual Machine to control an entire PCI-E device (e.g. NIC) while bypassing any VMM interference. The performance benefit will be a dramatic reduction in CPU utilization, but the precise gain will vary.
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