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rbd: set blk_queue request sizes to object size 

This improves performance since more requests can be merged.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
This commit is contained in:
Josh Durgin 2011-07-22 11:35:23 -07:00 committed by Sage Weil
parent e985222743
commit 029bcbd8b0
1 changed files with 15 additions and 0 deletions
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15
drivers/block/rbd.c
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@ -629,6 +629,14 @@ static int rbd_get_num_segments(struct rbd_image_header *header,
return end_seg - start_seg + 1; return end_seg - start_seg + 1;
} }
/*
* returns the size of an object in the image
*/
static u64 rbd_obj_bytes(struct rbd_image_header *header)
{
return 1 << header->obj_order;
}
/* /*
* bio helpers * bio helpers
*/ */
@ -1765,6 +1773,13 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock);
if (!q) if (!q)
goto out_disk; goto out_disk;
/* set io sizes to object size */
blk_queue_max_hw_sectors(q, rbd_obj_bytes(&rbd_dev->header) / 512ULL);
blk_queue_max_segment_size(q, rbd_obj_bytes(&rbd_dev->header));
blk_queue_io_min(q, rbd_obj_bytes(&rbd_dev->header));
blk_queue_io_opt(q, rbd_obj_bytes(&rbd_dev->header));
blk_queue_merge_bvec(q, rbd_merge_bvec); blk_queue_merge_bvec(q, rbd_merge_bvec);
disk->queue = q; disk->queue = q;