blk_queue_io_opt man page on Oracle

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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 3.8.	   June 2014		   BLK_QUEUE_IO_OPT(9)
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