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-rw-r--r--block/cfq-iosched.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index e59f2108272..579f3182246 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1905,10 +1905,13 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
* of tiny requests, because we disrupt the normal plugging
* and merging. If the request is already larger than a single
* page, let it rip immediately. For that case we assume that
- * merging is already done.
+ * merging is already done. Ditto for a busy system that
+ * has other work pending, don't risk delaying until the
+ * idle timer unplug to continue working.
*/
if (cfq_cfqq_wait_request(cfqq)) {
- if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE) {
+ if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE ||
+ cfqd->busy_queues > 1) {
del_timer(&cfqd->idle_slice_timer);
blk_start_queueing(cfqd->queue);
}