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This is a crazy good explanation and the illustrations go a long way.
I always wondered why L1 caches couldn't just be bigger. L1 caches need to be close to clock speed of the core and bigger caches means increased latency because the bottleneck is length of the bit line and number of word lines which increases with capacity.
A book length version of content of this quality would be an awesome coffee table book!
More than anything, I would love to know the software this is built in.

This is a goregous way of presenting a book, and what looks like subscriber only chapter previews.