blk_queue_io_opt (9) - Linux Man Pages
blk_queue_io_opt: set optimal request size for the queue
blk_queue_io_opt - set optimal request size for the queue
void blk_queue_io_opt(struct request_queue
*q, unsigned int opt);
- the request queue for the device
- optimal request size in bytes
Storage devices may report an optimal I/O size, which is the device's preferred unit for sustained I/O. This is rarely reported for disk drives. For RAID arrays it is usually the stripe width or the internal track size. A properly aligned multiple of optimal_io_size is the preferred request size for workloads where sustained throughput is desired.