aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorJosh Durgin <josh.durgin@dreamhost.com>2011-07-22 18:35:23 (GMT)
committerSage Weil <sage@newdream.net>2011-07-26 18:29:35 (GMT)
commit029bcbd8b076fd19787b8c73e58dd0a6f2c0caf1 (patch)
tree305128db78ecfb09e6a236caeeac1fbb9ece1175
parente9852227431a0ed6ceda064f33e4218757acab6c (diff)
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>
-rw-r--r--drivers/block/rbd.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 7392d7a..15f65b5 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -630,6 +630,14 @@ static int rbd_get_num_segments(struct rbd_image_header *header,
}
/*
+ * 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
*/
@@ -1765,6 +1773,13 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock);
if (!q)
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);
disk->queue = q;

Privacy Policy