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Commit 2d870722 authored by Jens Axboe's avatar Jens Axboe
Browse files

cfq-iosched: tweak kick logic a bit more 



We only kick the dispatch for an idling queue, if we think it's a
(somewhat) fully merged request. Also allow a kick if we have other
busy queues in the system, since we don't want to risk waiting for
a potential merge in that case. It's better to get some work done and
proceed.

Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 40bb54d1

block/cfq-iosched.c

+5 −2
Original line number Diff line number Diff line
@@ -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);

			}