Assume a 48 bit virtual address space (typical for a 64 bit Xeon achitecture). Assume 16KB pages, and real memory of 32GB How many entries in the page table? How many bits required to find a page in real memory? Do we need a dirty bit? A valid bit? How many bits to find a byte in the page? Assume 1 (8 byte) word for each page table entry, how many bytes does the page table need? If the page table is considered too big, we can use hierarchical or split page tables to allow parts of the page table to sit on disk or only be allocated when needed. These strategies add complexity and delay page lookup. Do we need to do this here