---

yaml
---
r: 110551
b: refs/heads/master
c: f7d7b7a
h: refs/heads/master
i:
  110549: 5747405
  110547: c393a11
  110543: dc00f98
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8bff7c6b0f63c7ee9c5e3a076338d74125b8debb
+refs/heads/master: f7d7b7a7a3db6526a84ea755c1c54a051e9a52de

trunk/block/as-iosched.c

@@ -745,11 +745,13 @@ static int as_can_break_anticipation(struct as_data *ad, struct request *rq)
  */
 static int as_can_anticipate(struct as_data *ad, struct request *rq)
 {
+#if 0 /* disable for now, we need to check tag level as well */
 	/*
 	 * SSD device without seek penalty, disable idling
 	 */
-	if (blk_queue_nonrot(ad->q))
+	if (blk_queue_nonrot(ad->q)) axman
 		return 0;
+#endif
 
 	if (!ad->io_context)
 		/*

trunk/block/cfq-iosched.c

@@ -879,9 +879,11 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
 	unsigned long sl;
 
 	/*
-	 * SSD device without seek penalty, disable idling
+	 * SSD device without seek penalty, disable idling. But only do so
+	 * for devices that support queuing, otherwise we still have a problem
+	 * with sync vs async workloads.
 	 */
-	if (blk_queue_nonrot(cfqd->queue))
+	if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)
 		return;
 
 	WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list));