But the cache is oblivious to which links the TCP connections are going over (well, except via latency & throughput as the post showed). If I understand what y

But the cache is oblivious to which links the TCP connections are going over (well, except via latency & throughput as the post showed). If I understand what you propose, they need to add more bookkeeping to track what the connection did, instead of just doing pool.insert(conn_fd, time.now()). It sounds like the fix was just swapping the side you evict from, which could have been as little as a one line change. Without a bit more information I think I am just speculating and don't really know. Their solution doesn't really taste bad to me though.