The ESXi host VMDirectPath maximums represent limits for VMDirectPath.

Table 1. VMDirectPath Maximums



VMDirectPath PCI/PCIe devices per virtual machine


SR-IOV Number of virtual functions


SR-IOV supports up to 43 virtual functions on supported Intel NICs and up to 64 virtual functions on supported Emulex NICs. The actual number of virtual functions available for passthrough depends on the number of interrupt vectors required by each of them and on the hardware configuration of the host. Each ESXi host has a limited number of interrupt vectors. When the host boots, devices on the host such as storage controllers, physical network adapters, and USB controllers consume a subset of the total number of vectors. Depending upon the number of vectors these devices consume, the maximum number of potentially supported VFs could be reduced.