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Revert "block: improve queue_should_plug() by looking at IO depths"

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This reverts commit fb1e75389b.

"Benjamin S." <[email protected]> reports that the patch in question
causes a big drop in sequential throughput for him, dropping from
200MB/sec down to only 70MB/sec.

Needs to be investigated more fully, for now lets just revert the
offending commit.

Conflicts:

	include/linux/blkdev.h

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2010-02-23 08:40:43 +01:00
commit 79da0644a8
2 changed files with 3 additions and 12 deletions
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11
block/blk-core.c
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@ -1147,7 +1147,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
*/
static inline bool queue_should_plug(struct request_queue *q)
{
return !(blk_queue_nonrot(q) && blk_queue_queuing(q));
return !(blk_queue_nonrot(q) && blk_queue_tagged(q));
}
static int __make_request(struct request_queue *q, struct bio *bio)
@ -1859,15 +1859,8 @@ void blk_dequeue_request(struct request *rq)
* and to it is freed is accounted as io that is in progress at
* the driver side.
*/
if (blk_account_rq(rq)) {
if (blk_account_rq(rq))
q->in_flight[rq_is_sync(rq)]++;
/*
* Mark this device as supporting hardware queuing, if
* we have more IOs in flight than 4.
*/
if (!blk_queue_queuing(q) && queue_in_flight(q) > 4)
set_bit(QUEUE_FLAG_CQ, &q->queue_flags);
}
}
/**