Yonah's L2 cache - granularity and porting

Posted on Thursday, August 25 2005 @ 9:47 CEST by Thomas De Maesschalck
The mobile dual-core Yonah processor will feature a shared L2 cache but you may be craving for some more information on how this works. Well The Inquirer provides us with some information and says there are two key factors, granularity and porting.
Granularity is the most interesting one, when the cache is partitioned on the fly, who gets to chose what core gets what? That is more of a software problem, but how many pieces can they carve the cache into? On Yonah, it can be sliced up into cacheline level granularity, about the best you can hope for.

How about access? If both cores need the same data, say a piece of code running a thread on each core, who gets rights to it? Is it multi-ported so it can be hit by both sides at once? In Yonah, the answer is no, the lines are accessed serially. Not optimal, but given the granularity, it probably won't be a problem very often.

About the Author

Thomas De Maesschalck

Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.

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