Does accessing a single struct member pull the entire struct into the Cache?

Question

I\'ve been reading Ulrich Drepper\'s, \"What every programmer should know about memory\" and in section 3.3.2 Measurements of Cache Effects ( halfway down the page ) it gives me

Answer 1

Accessing a struct member causes no more of a performance penalty than accessing any other area in memory. In fact, there may be a performance improvement if you access several struct members in the same area, since other members might be cached by the first access.