The multi-queue block layer (blk-mq) has indeed made it for Linux 3.13 as one (of many other) exciting features. The multi-queue block layer can lead to better SSD performance through reducing latency by balancing I/O workload across multiple CPU cores and allowing for multiple hardware queues...
November 14, 2013
Multi-Queue Block Layer Is Merged For Linux 3.13
Read more at Phoronix