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-rw-r--r--block/as-iosched.c4
-rw-r--r--block/cfq-iosched.c6
2 files changed, 7 insertions, 3 deletions
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 4c6fafbba933..71f0abb219ee 100644
--- a/block/as-iosched.c
+++ b/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)
/*
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 03a5953bb5df..6a062eebbd15 100644
--- a/block/cfq-iosched.c
+++ b/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));