blk_queue_io_min — set minimum request size for the queue


void blk_queue_io_min (struct request_queue * q,
 unsigned int min);


struct request_queue * q

the request queue for the device

unsigned int min

smallest I/O size in bytes


Storage devices may report a granularity or preferred minimum I/O size which is the smallest request the device can perform without incurring a performance penalty. For disk drives this is often the physical block size. For RAID arrays it is often the stripe chunk size. A properly aligned multiple of minimum_io_size is the preferred request size for workloads where a high number of I/O operations is desired.