BLK_LIMITS_IO_OPT(9)                      Block Devices                      BLK_LIMITS_IO_OPT(9)



NAME
       blk_limits_io_opt - set optimal request size for a device

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

ARGUMENTS
       limits
           the queue limits

       opt
           smallest I/O 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 4.8.                 January 2017                      BLK_LIMITS_IO_OPT(9)