blk_queue_chunk_sectors (9) Linux Manual Page
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
q
-
- 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.