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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-10-17 13:58:29 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-12-29 08:28:45 +0100 |
| commit | a31a97381cdf7dceb03b797a8faf9bc8a01c65d1 (patch) | |
| tree | 268f86dc23b8338396faf5b891af60a7fb23929f | |
| parent | a185eb4bc84155fff35b602ce99602c010de9634 (diff) | |
| download | linux-a31a97381cdf7dceb03b797a8faf9bc8a01c65d1.tar.bz2 | |
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>
| -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 b1fd4f5f07d3..a824e49c0d0a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -268,8 +268,7 @@ 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); @@ -1241,11 +1240,11 @@ 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; |