diff options
| author | Dave Kleikamp <dave.kleikamp@oracle.com> | 2011-12-15 22:44:45 +0100 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-11-19 16:18:46 +0100 |
| commit | 6e24dffcbacea0c2537ffad3f165fa06d14ddc10 (patch) | |
| tree | 53e3e1797c769726c4f602c57dab9cbc95c9cbe8 | |
| parent | a69a6d3b998143407295884c2dba110e3f7cceaf (diff) | |
AIO: Don't plug the I/O queue in do_io_submit()
Asynchronous I/O latency to a solid-state disk greatly increased
between the 2.6.32 and 3.0 kernels. By removing the plug from
do_io_submit(), we observed a 34% improvement in the I/O latency.
Unfortunately, at this level, we don't know if the request is to
a rotating disk or not.
Change-Id: I7101df956473ed9fd5dcff18e473dd93b688a5c1
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: linux-aio@kvack.org
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
| -rw-r--r-- | fs/aio.c | 5 |
1 files changed, 0 insertions, 5 deletions
@@ -1165,7 +1165,6 @@ long do_io_submit(aio_context_t ctx_id, long nr, struct kioctx *ctx; long ret = 0; int i = 0; - struct blk_plug plug; if (unlikely(nr < 0)) return -EINVAL; @@ -1182,8 +1181,6 @@ long do_io_submit(aio_context_t ctx_id, long nr, return -EINVAL; } - blk_start_plug(&plug); - /* * AKPM: should this return a partial result if some of the IOs were * successfully submitted? @@ -1206,8 +1203,6 @@ long do_io_submit(aio_context_t ctx_id, long nr, if (ret) break; } - blk_finish_plug(&plug); - put_ioctx(ctx); return i ? i : ret; } |