Quiz submission record for quiz7-1-2 at Tue Aug  3 03:28:51 2004:

Your Answer for Question 1:
L1 cache and TLB are both "caches" but L1 cache is a cache for the data in memory, whereas the TLB is a cache on the page table mappings.  Even though L1 cache is much, much bigger, we have a high miss rate because we might be accessing anything located anywhere in data memory.  The TLB is different because it's simply a buffer that holds virtual page address to physical page address translations; and any particular page in memory can hold anywhere from 4kb to 64kb, so we cover a lot of data.  L1 cache blocks, on the other hand, often only contain 4 to 16 bytes.

Your Answer for Question 2:
I can't seem to find the section in the book about multilevel paging...
But I think the answer is no, because the super page table is supposed to be a page table for page tables in a multilevel page table implementation.  We need the super page to cover a large range of pages, which is why we borrow the most significant digits to find the second level page.  If we moved the SPN to the right of the 2PN, we lose that range.


Your unique submission ID is quiz7-1-2-cs61c-ck-1091528931-146.