If there was a core to core bulk messaging system, it would be memory mapped as well, and you'd need to store the messages in some sort of memory, so why add a

If there was a core to core bulk messaging system, it would be memory mapped as well, and you'd need to store the messages in some sort of memory, so why add a specialized message queue, when you can just use memory? So one could code inter-thread communication without having to think about inducing large numbers of cache misses and degrading performance.