The Microsoft Windows codename "Longhorn" operating system will include support for resource rebalancing at multiple levels across a PCI hierarchy. Windows Longhorn multi-level rebalancing supports systems that use multiple PCI-to-PCI bridge levels, including CardBus bridges, and also enhances support for hot plug technologies. However, multi-level rebalancing can expose problems in device drivers that do not handle Plug and Play I/O request packets (IRPs) correctly. This paper discusses potential driver problems and Windows Longhorn multi-level rebalancing support, and also provides implementation details for driver developers.
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