Commit d3805611 authored Dec 22, 2015 by Keith Busch Committed by Jens Axboe Dec 22, 2015

block: Split bios on chunk boundaries



For h/w that advertise their block storage's underlying chunk size, it's
a big performance win to not submit commands that cross them. This patch
uses that criteria if it is provided. If it is not provided, this patch
uses the max sectors as before.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent 24bc3ea5

block/blk-merge.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -81,7 +81,7 @@ static struct bio blk_bio_segment_split(struct request_queue q,
		struct bio *new = NULL;

		bio_for_each_segment(bv, bio, iter) {
		if (sectors + (bv.bv_len >> 9) > queue_max_sectors(q))
		if (sectors + (bv.bv_len >> 9) > blk_max_size_offset(q, bio->bi_iter.bi_sector))
		goto split;

		/*