1. A design structure embodied in a machine readable storage medium for at least one of designing, manufacturing, and testing a design, said design structure comprising: a computer system comprising: a memory management unit for controlling an address conversion, said address conversion translating an address received from a processor to a physical address; a main memory unit connected to said memory management unit, said main memory unit comprising: main memory comprising a page table accessed by said memory management unit for an address conversion; a memory controller for controlling said main memory, wherein said memory controller comprises a page table walker for proceeding through entries of said page table; cache circuitry for storing recently requested data; a first apparatus for routing a page data request between said memory management unit and said page table walker, whereby said cache circuitry is bypassed; and a second apparatus for determining whether a page data request is to be routed via said first apparatus, wherein said second apparatus determines whether said page data request is to be routed via said first apparatus based upon a flag in said page data request.