diff options
| author | Jens Axboe <jens.axboe@oracle.com> | 2010-02-23 08:40:43 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-02-23 08:40:43 +0100 |
| commit | 79da0644a8e0838522828f106e4049639eea6baf (patch) | |
| tree | 4dbb8e1a3a4be78a79f14e8ebac5d6fe817a2fb4 /block | |
| parent | 9f3a6284880ceea452903e2043c88d7226736318 (diff) | |
| download | lwn-79da0644a8e0838522828f106e4049639eea6baf.tar.gz lwn-79da0644a8e0838522828f106e4049639eea6baf.zip | |
Revert "block: improve queue_should_plug() by looking at IO depths"
This reverts commit fb1e75389bd06fd5987e9cda1b4e0305c782f854.
"Benjamin S." <sbenni@gmx.de> 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 <jens.axboe@oracle.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 718897e6d37f..d1a9a0a64f95 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -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); - } } /** |