centos man page for blk_limits_io_opt

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 3.10					     June 2014						      BLK_LIMITS_IO_OPT(9)