commit f9b6b98d24f7cec5b8269217f9d4fdec1ca43218
author Hannes Reinecke <hare@suse.de> Fri Jan 31 11:37:39 2020 +0100
committer Ilya Dryomov <idryomov@gmail.com> Mon Mar 30 12:42:40 2020 +0200
tree cbba5e01f87be19827df00dd7efc13d73114098f
parent 59e542c869895fb37005b60058a342187bb63c61

rbd: enable multiple blk-mq queues

Allocate one queue per CPU and get a performance boost from
higher parallelism.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

drivers/block/rbd.c

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 3af09a0..1e0a6b1 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -4970,7 +4970,7 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
 	rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth;
 	rbd_dev->tag_set.numa_node = NUMA_NO_NODE;
 	rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
-	rbd_dev->tag_set.nr_hw_queues = 1;
+	rbd_dev->tag_set.nr_hw_queues = num_present_cpus();
 	rbd_dev->tag_set.cmd_size = sizeof(struct rbd_img_request);
 
 	err = blk_mq_alloc_tag_set(&rbd_dev->tag_set);