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. July 2010 BLK_QUEUE_IO_OPT(9)
