blk_limits_io_opt — set optimal request size for a device


void blk_limits_io_opt (struct queue_limits * limits,
 unsigned int opt);


struct queue_limits * limits

the queue limits

unsigned int opt

smallest I/O 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.