Chapter 9 - Question #7 of 7

How does segmentation differ from paging? Give some user issues with segmentation. Can segmentation be combined with paging? If so, how?

Segmentation is different than paging in that a segment can have a variable size.  Some issues with segmentation are external fragmentation, and the start address problem.  Instead of concatenating to get the physical address using paging, segmentation must add the start address to the offset to get the address of the data.  The process of adding is much more time consuming than concatenating.  Segmentation can be combined with paging, which creates segment from pages rather than continuous blocks of memory.  This method is advantageous because one contiguous block doesn't need to be found to hold the entire segment.  It also decreases external defragmentation, but increases internal defragmentation.

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