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authorJens Axboe <jens.axboe@oracle.com>2010-02-23 08:40:43 +0100
committerJens Axboe <jens.axboe@oracle.com>2010-02-23 08:40:43 +0100
commit79da0644a8e0838522828f106e4049639eea6baf (patch)
tree4dbb8e1a3a4be78a79f14e8ebac5d6fe817a2fb4 /block/blk-core.c
parent9f3a6284880ceea452903e2043c88d7226736318 (diff)
downloadlinux-2.6.34-ux500-79da0644a8e0838522828f106e4049639eea6baf.tar.gz
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/blk-core.c')
-rw-r--r--block/blk-core.c11
1 files changed, 2 insertions, 9 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 718897e6d37..d1a9a0a64f9 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);
- }
}
/**