Documentation/block/blk-mq.rst

37 spawns multiple queues with individual entry points local to the CPU, removing
49 blk-mq has two group of queues: software staging queues and hardware dispatch
50 queues. When the request arrives at the block layer, it will try the shortest
56 Then, after the requests are processed by software queues, they will be placed
62 Software staging queues
65 The block IO subsystem adds requests in the software staging queues
71 the number of queues is defined by a per-CPU or per-node basis.
93 requests from different queues, otherwise there would be cache trashing and a
99 queue (a.k.a. run the hardware queue), the software queues mapped to that
102 Hardware dispatch queues
106 used by device drivers to map the device submission queues (or device DMA ring
109 block layer removes requests from the associated software queues and tries to
116 requests that were ready to be sent first. The number of hardware queues
120 hardware queues to send requests for.