Required mainly for clients, allows to scale parallel client I/O with TCP from 100-150k iops to ~400k iops and from 2-3 GB/s to at least 7-8 GB/s with 4 I/O threads, at the same time increasing Q=1 latency by 2x thread switching delay, which is ~10 us when CPU powersaving is disabled and may be as high as 200 us when it's enabled.