On Fri, Jan 19, 2018 at 12:14:24AM +0000, Bart Van Assche wrote:

On Fri, 2018-01-19 at 08:11 +0800, Ming Lei wrote:

quoted

On Thu, Jan 18, 2018 at 08:37:07AM -0800, Bart Van Assche wrote:

quoted

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index f16096af879a..c59c59cfd2a5 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c

@@ -761,6 +761,7 @@ static blk_status_t dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
 		/* Undo dm_start_request() before requeuing */
 		rq_end_stats(md, rq);
 		rq_completed(md, rq_data_dir(rq), false);
+		blk_mq_delay_run_hw_queue(hctx, 100/*ms*/);
 		return BLK_STS_RESOURCE;
 	}
 

Nak.

This patch fixes a regression that was introduced by you. You should know
that regressions are not acceptable. If you don't agree with this patch,
please fix the root cause.

Yesterday I sent a patch, did you test that?

-- 
Ming