[bunnythefifth]

> Can your neighbor, who shares your L3 cache, be using memory so much more aggressively than you that it causes you to evict your L2/L1 cache?

I'm curious. How could the "neighbor" possibly evict your L1/L2 when it is local to you? Worst it can do is thrash L3 like crazy but if your own data is on L1/L2, how would that get affected?

[lend000]

I believe most caches are designed such that something in a lower level cache obtains information about whether that memory is valid or has been changed from the cache level above it, so typically everything in L1 is also in L2 and L3. If you do not have the data in L3 anymore, this may cause the L1 to reload the memory (into L3 then L2 then L1) to know that the memory is valid.