diff options
| author | Jens Axboe <jens.axboe@oracle.com> | 2008-10-17 13:58:29 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-12-03 13:03:56 +0100 |
| commit | 5d89139ffa484aff47a7b69db520b9bbd9d2d191 (patch) | |
| tree | d11c023547cfe7b746485a20b840b95368c65bfa /block | |
| parent | 052d6b58278a1425dfe9c523d647a105a8436cb2 (diff) | |
block: don't use plugging on SSD devices
We just want to hand the first bits of IO to the device as fast
as possible. Gains a few percent on the IOPS rate.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index cc8364231a3d..953bec0295dd 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -254,8 +254,7 @@ void __generic_unplug_device(struct request_queue *q) { if (unlikely(blk_queue_stopped(q))) return; - - if (!blk_remove_plug(q)) + if (!blk_remove_plug(q) && !blk_queue_nonrot(q)) return; q->request_fn(q); @@ -1233,11 +1232,11 @@ get_rq: if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) || bio_flagged(bio, BIO_CPU_AFFINE)) req->cpu = blk_cpu_to_group(smp_processor_id()); - if (elv_queue_empty(q)) + if (!blk_queue_nonrot(q) && elv_queue_empty(q)) blk_plug_device(q); add_request(q, req); out: - if (sync) + if (sync || blk_queue_nonrot(q)) __generic_unplug_device(q); spin_unlock_irq(q->queue_lock); return 0; |