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| author | Christoph Hellwig <hch@lst.de> | 2019-10-28 19:23:26 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-11-04 18:56:42 +0100 |
| commit | 9dea0c81ee4a7b5d8e5bc0d4cfa2ee4f0e7b13f0 (patch) | |
| tree | 55bdba5501fc243ac550b5eea27368bd9f759b95 | |
| parent | nvmet: clean up command parsing a bit (diff) | |
| download | linux-9dea0c81ee4a7b5d8e5bc0d4cfa2ee4f0e7b13f0.tar.xz linux-9dea0c81ee4a7b5d8e5bc0d4cfa2ee4f0e7b13f0.zip | |
nvmet: add plugging for read/write when ns is bdev
With reference to the following issue reported on the mailing list :-
http://lists.infradead.org/pipermail/linux-nvme/2019-October/027604.html
this patch adds plugging for the bdev-ns under nvmet_bdev_execute_rw().
We can see the following performance improvement in random write
workload I/Os with the setup described in the link when device_path
configured as /dev/md0.
Without this patch :-
write: IOPS=40.8k, BW=159MiB/s (167MB/s)(4777MiB/30002msec)
write: IOPS=41.2k, BW=161MiB/s (169MB/s)(4831MiB/30011msec)
slat (usec): min=8, max=10823, avg=15.64, stdev=16.85
slat (usec): min=8, max=401, avg=15.40, stdev= 9.56
clat (usec): min=54, max=2492, avg=759.07, stdev=172.62
clat (usec): min=56, max=1997, avg=768.06, stdev=178.72
With this patch :-
write: IOPS=123k, BW=480MiB/s (504MB/s)(14.1GiB/30011msec)
write: IOPS=123k, BW=481MiB/s (504MB/s)(14.1GiB/30002msec)
slat (usec): min=8, max=9941, avg=13.31, stdev= 8.04
slat (usec): min=8, max=289, avg=13.31, stdev= 3.37
clat (usec): min=43, max=17635, avg=245.46, stdev=171.23
clat (usec): min=44, max=17751, avg=245.25, stdev=183.14
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/nvme/target/io-cmd-bdev.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c index 04a9cd2a2604..07e4f8c579d3 100644 --- a/drivers/nvme/target/io-cmd-bdev.c +++ b/drivers/nvme/target/io-cmd-bdev.c @@ -147,6 +147,7 @@ static void nvmet_bdev_execute_rw(struct nvmet_req *req) int sg_cnt = req->sg_cnt; struct bio *bio; struct scatterlist *sg; + struct blk_plug plug; sector_t sector; int op, op_flags = 0, i; @@ -185,6 +186,7 @@ static void nvmet_bdev_execute_rw(struct nvmet_req *req) bio->bi_end_io = nvmet_bio_done; bio_set_op_attrs(bio, op, op_flags); + blk_start_plug(&plug); for_each_sg(req->sg, sg, req->sg_cnt, i) { while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) != sg->length) { @@ -204,6 +206,7 @@ static void nvmet_bdev_execute_rw(struct nvmet_req *req) } submit_bio(bio); + blk_finish_plug(&plug); } static void nvmet_bdev_execute_flush(struct nvmet_req *req) |