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I/O Resource Usage Reduction

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Microsoft has implemented support to help reduce the dependence that PCI, PCI-X, and PCI Express devices have on the usage of input/output (I/O) space addresses that are accessed by the I/O base address registers (BARs). The number of I/O resources used on a personal computer has continued to increase over the years. This I/O resource usage on PCI, PCI-X, and PCI Express buses is increasingly becoming a cause of resource contention problems. These problems are expected to become worse for systems using PCI Express buses, compared to those using PCI and PCI-X buses, due to the number of virtual PCI-to-PCI bridges that are used in both client and server systems. It is therefore becoming more necessary to transition hardware designs away from reliance on I/O resources and onto using memory resources, which are much more plentiful. For more information on how device manufacturers, driver developers, firmware engineers, and system manufacturers can disable unused I/O BARs and reduce or eliminate the amount of I/O space used in a computer, refer to the I/O Resource Usage Reduction white paper.

To reduce I/O resource usage in Windows 10, place the following entry in the device driver's INF file:

[DDInstall.HW]
Include=pci.inf
Needs=PciIoSpaceNotRequired.HW

In Windows 8.1 and earlier, use this entry instead:

[DDInstall.HW]
Include=machine.inf
Needs=PciIoSpaceNotRequired