blk_queue_chunk_sectors (9) - Linux Manuals

blk_queue_chunk_sectors: set size of the chunk for this queue

Command to display blk_queue_chunk_sectors manual in Linux: $ man 9 blk_queue_chunk_sectors

NAME

blk_queue_chunk_sectors - set size of the chunk for this queue

SYNOPSIS

void blk_queue_chunk_sectors(struct request_queue * q, unsigned int chunk_sectors);

ARGUMENTS

: the request queue for the device

chunk_sectors

: chunk sectors in the usual 512b unit

DESCRIPTION

If a driver doesn't want IOs to cross a given chunk size, it can set this limit and prevent merging across chunks. Note that the chunk size must currently be a power-of-2 in sectors. Also note that the block layer must accept a page worth of data at any offset. So if the crossing of chunks is a hard limitation in the driver, it must still be prepared to split single page bios.