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I've been hearing rumors that AMD's current offerings have been starting to avoid even shared cache between processors. It boggles my mind that any CPU designer
by milesvp 7y ago
I've been hearing rumors that AMD's current offerings have been starting to avoid even shared cache between processors. It boggles my mind that any CPU designer would think a shared L2 cache is a good idea. Makes me wonder where my model of memory starts to break down. I always just think of L2 as being slower, less expensive memory than L1. I'm wondering if there are any benefits that actually outweigh the cache eviction penalty of multiple processors accessing it...
- kardos 7y agoIt's surely an engineering tradeoff resulting from weighing the different pros/cons. If you had dedicated cache per core at 1/Nth the size, much of it would be wasted when you're running less than full tilt -- eg, if you're using 2/4 cores then half of the cache is artificially unavailable instead of doubling the cache available to those 2 cores.
- gpderetta 7y agoL2 hasn't been shared for a very long time.