BLK_QUEUE_IO_OPT(9) Block Devices BLK_QUEUE_IO_OPT(9)

NAME blk_queue_io_opt - set optimal request size for the queue

SYNOPSIS void blk_queue_io_opt(struct request_queue * q, unsigned int opt);

ARGUMENTS q the request queue for the device

opt optimal request size in bytes

DESCRIPTION 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.

COPYRIGHT Kernel Hackers Manual 2.6. November 2011 BLK_QUEUE_IO_OPT(9)