blk_limits_io_opt — set optimal request size for a device
void blk_limits_io_opt ( | struct queue_limits * limits, |
unsigned int opt); |
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.