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Microsoft Resource Kits - Windows 2000 Resource Kit

Intfiltr.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Intfiltr.exe - Interrupt Filter
IntFiltr is a command-line tool used on multiprocessor systems to affinitize interrupts of disk or network adapters to one or more processors. Affinitizing interrupts to a processor can improve system performance by improving processor cache locality. Using IntFiltr, you can direct a device's interrupts to a specific set of processors. In a computer with multiple processors, Microsoft® Windows® 2000 sets (by default) the interrupt controller to direct a device's interrupts at any available processor. This means an interrupt will be serviced by the processor with the lowest priority, or IRQL