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Message-ID: <5ab07cf8-a2a5-a60e-c86a-ab6ea53990bb@huawei.com>
Date: Mon, 2 Aug 2021 21:34:24 +0800
From: "yukuai (C)" <yukuai3@...wei.com>
To: Bart Van Assche <bvanassche@....org>, <axboe@...nel.dk>,
<ming.lei@...hat.com>
CC: <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<yi.zhang@...wei.com>
Subject: Re: [PATCH] blk-mq: allow hardware queue to get more tag while
sharing a tag set
On 2021/08/01 1:15, Bart Van Assche wrote:
> On 7/11/21 8:18 PM, Yu Kuai wrote:
>> If there are multiple active queues while sharing a tag set, it's not
>> necessary to limit the available tags as same share for each active queue
>> if no one ever failed to get driver tag. And fall back to same share if
>> someone do failed to get driver tag.
>>
>> This modification will be beneficial if total queue_depth of disks
>> on the same host is less than total tags.
>
> This patch adds new atomic operations in the hot path and hence probably
> has a negative performance impact. What is the performance impact of
> this patch for e.g. null_blk when submitting I/O from all CPU cores?
>
> Thanks,
>
> Bart.
> .
>
Hi, Bart
I run a test on both null_blk and nvme, results show that there are no
performance degradation:
test platform: x86
test cpu: 2 nodes, total 72
test scheduler: none
test device: null_blk / nvme
test cmd: fio -filename=/dev/xxx -name=test -ioengine=libaio -direct=1
-numjobs=72 -iodepth=16 -bs=4k -rw=write -offset_increment=1G
-cpus_allowed=0:71 -cpus_allowed_policy=split -group_reporting
-runtime=120
test results: iops
1) null_blk before this patch: 280k
2) null_blk after this patch: 282k
3) nvme before this patch: 378k
4) nvme after this patch: 384k
details:
1) null_blk before this patch:
test: (g=0): rw=write, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
4096B-4096B, ioengine=libaio, iodepth=16
...
fio-3.13-42-g8066f
Starting 72 processes
Jobs: 72 (f=72): [W(72)][100.0%][w=1095MiB/s][w=280k IOPS][eta 00m:00s]
test: (groupid=0, jobs=72): err= 0: pid=4986: Mon Aug 2 11:25:33 2021
write: IOPS=279k, BW=1091MiB/s (1144MB/s)(128GiB/120009msec); 0 zone
resets
slat (nsec): min=1069, max=1837.6M, avg=240280.55, stdev=3604257.00
clat (usec): min=89, max=1837.9k, avg=3882.70, stdev=13528.70
lat (usec): min=175, max=1837.9k, avg=4123.03, stdev=13939.66
clat percentiles (usec):
| 1.00th=[ 223], 5.00th=[ 223], 10.00th=[ 225], 20.00th=[
231],
| 30.00th=[ 478], 40.00th=[ 873], 50.00th=[ 1811], 60.00th=[
2737],
| 70.00th=[ 4293], 80.00th=[ 6915], 90.00th=[ 9372], 95.00th=[
12780],
| 99.00th=[ 18482], 99.50th=[ 22676], 99.90th=[ 62129],
99.95th=[231736],
| 99.99th=[641729]
bw ( MiB/s): min= 32, max= 3681, per=100.00%, avg=1106.55,
stdev=25.25, samples=17006
iops : min= 8405, max=942588, avg=283276.25, stdev=6464.60,
samples=17006
lat (usec) : 100=0.01%, 250=24.18%, 500=8.74%, 750=4.72%, 1000=4.01%
lat (msec) : 2=12.28%, 4=12.86%, 10=24.23%, 20=8.06%, 50=0.81%
lat (msec) : 100=0.02%, 250=0.04%, 500=0.03%, 750=0.01%, 1000=0.01%
lat (msec) : 2000=0.01%
cpu : usr=0.35%, sys=0.79%, ctx=35473919, majf=0, minf=1419
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued rwts: total=0,33525688,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=16
Run status group 0 (all jobs):
WRITE: bw=1091MiB/s (1144MB/s), 1091MiB/s-1091MiB/s
(1144MB/s-1144MB/s), io=128GiB (137GB), run=120009-120009msec
Disk stats (read/write):
nullb0: ios=0/33485328, merge=0/0, ticks=0/4817009, in_queue=4817009,
util=100.00%
2) null_blk after this patch:
test: (g=0): rw=write, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
4096B-4096B, ioengine=libaio, iodepth=16
...
fio-3.13-42-g8066f
Starting 72 processes
Jobs: 72 (f=72): [W(72)][100.0%][w=1101MiB/s][w=282k IOPS][eta 00m:00s]
test: (groupid=0, jobs=72): err= 0: pid=5001: Mon Aug 2 10:36:52 2021
write: IOPS=281k, BW=1097MiB/s (1150MB/s)(129GiB/120009msec); 0 zone
resets
slat (nsec): min=1104, max=5358.9M, avg=239050.23, stdev=4040598.71
clat (usec): min=2, max=5359.3k, avg=3862.86, stdev=15270.20
lat (usec): min=4, max=5359.3k, avg=4101.96, stdev=15742.32
clat percentiles (usec):
| 1.00th=[ 221], 5.00th=[ 223], 10.00th=[ 225], 20.00th=[
231],
| 30.00th=[ 482], 40.00th=[ 1106], 50.00th=[ 1909], 60.00th=[
3163],
| 70.00th=[ 4490], 80.00th=[ 5538], 90.00th=[ 10683], 95.00th=[
14877],
| 99.00th=[ 16450], 99.50th=[ 19530], 99.90th=[ 30802], 99.95th=[
34341],
| 99.99th=[650118]
bw ( MiB/s): min= 23, max= 4395, per=100.00%, avg=1119.48,
stdev=27.64, samples=16872
iops : min= 5906, max=1125367, avg=286585.88, stdev=7075.29,
samples=16872
lat (usec) : 4=0.01%, 10=0.01%, 20=0.01%, 50=0.01%, 250=24.77%
lat (usec) : 500=6.12%, 750=4.51%, 1000=3.97%
lat (msec) : 2=11.02%, 4=15.75%, 10=23.34%, 20=10.15%, 50=0.34%
lat (msec) : 100=0.01%, 250=0.01%, 500=0.01%, 750=0.01%, 1000=0.01%
lat (msec) : 2000=0.01%, >=2000=0.01%
cpu : usr=0.36%, sys=0.79%, ctx=35506798, majf=0, minf=966
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued rwts: total=0,33697894,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=16
Run status group 0 (all jobs):
WRITE: bw=1097MiB/s (1150MB/s), 1097MiB/s-1097MiB/s
(1150MB/s-1150MB/s), io=129GiB (138GB), run=120009-120009msec
Disk stats (read/write):
nullb0: ios=0/33657152, merge=0/0, ticks=0/4812746, in_queue=4812745,
util=100.00%
3) nvme before this patch:
test: (g=0): rw=write, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
4096B-4096B, ioengine=libaio, iodepth=16
...
fio-3.13-42-g8066f
Starting 72 processes
Jobs: 72 (f=72): [W(72)][100.0%][w=1478MiB/s][w=378k IOPS][eta 00m:00s]
test: (groupid=0, jobs=72): err= 0: pid=4780: Mon Aug 2 11:22:36 2021
write: IOPS=382k, BW=1491MiB/s (1564MB/s)(175GiB/120113msec); 0 zone
resets
slat (nsec): min=1234, max=328006k, avg=102467.85, stdev=4967629.26
clat (nsec): min=1788, max=329044k, avg=2899631.83, stdev=24819488.97
lat (usec): min=31, max=424004, avg=3004.41, stdev=25334.53
clat percentiles (usec):
| 1.00th=[ 39], 5.00th=[ 39], 10.00th=[ 39], 20.00th=[
39],
| 30.00th=[ 40], 40.00th=[ 40], 50.00th=[ 40], 60.00th=[
40],
| 70.00th=[ 41], 80.00th=[ 41], 90.00th=[ 42], 95.00th=[
45],
| 99.00th=[132645], 99.50th=[252707], 99.90th=[287310],
99.95th=[291505],
| 99.99th=[304088]
bw ( MiB/s): min= 783, max= 2394, per=100.00%, avg=1492.49, stdev=
5.56, samples=17278
iops : min=200590, max=613014, avg=382076.48, stdev=1424.37,
samples=17278
lat (usec) : 2=0.01%, 4=0.01%, 20=0.01%, 50=95.89%, 100=0.06%
lat (usec) : 250=0.06%, 500=0.15%, 750=0.18%, 1000=0.22%
lat (msec) : 2=0.96%, 4=0.60%, 10=0.21%, 20=0.05%, 50=0.18%
lat (msec) : 100=0.27%, 250=0.65%, 500=0.51%
cpu : usr=0.44%, sys=0.94%, ctx=123991, majf=0, minf=988
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued rwts: total=0,45859799,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=16
Run status group 0 (all jobs):
WRITE: bw=1491MiB/s (1564MB/s), 1491MiB/s-1491MiB/s
(1564MB/s-1564MB/s), io=175GiB (188GB), run=120113-120113msec
Disk stats (read/write):
nvme0n1: ios=308/45807739, merge=0/0, ticks=57/2334550,
in_queue=2334607, util=100.00%
4) nvme after this patch:
after: nvme
test: (g=0): rw=write, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
4096B-4096B, ioengine=libaio, iodepth=16
...
fio-3.13-42-g8066f
Starting 72 processes
Jobs: 72 (f=72): [W(72)][100.0%][w=1502MiB/s][w=384k IOPS][eta 00m:00s]
test: (groupid=0, jobs=72): err= 0: pid=5320: Mon Aug 2 10:42:07 2021
write: IOPS=383k, BW=1496MiB/s (1569MB/s)(175GiB/120098msec); 0 zone
resets
slat (nsec): min=1229, max=370007k, avg=100549.47, stdev=4919208.81
clat (nsec): min=1634, max=370050k, avg=2892105.62, stdev=24891976.05
lat (usec): min=31, max=380005, avg=2995.16, stdev=25391.59
clat percentiles (usec):
| 1.00th=[ 38], 5.00th=[ 39], 10.00th=[ 39], 20.00th=[
39],
| 30.00th=[ 39], 40.00th=[ 40], 50.00th=[ 40], 60.00th=[
40],
| 70.00th=[ 41], 80.00th=[ 41], 90.00th=[ 42], 95.00th=[
44],
| 99.00th=[135267], 99.50th=[252707], 99.90th=[287310],
99.95th=[291505],
| 99.99th=[304088]
bw ( MiB/s): min= 827, max= 2248, per=100.00%, avg=1496.99, stdev=
5.51, samples=17278
iops : min=211931, max=575591, avg=383228.21, stdev=1411.19,
samples=17278
lat (usec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=95.83%
lat (usec) : 100=0.15%, 250=0.05%, 500=0.13%, 750=0.18%, 1000=0.21%
lat (msec) : 2=0.85%, 4=0.84%, 10=0.14%, 20=0.05%, 50=0.14%
lat (msec) : 100=0.25%, 250=0.65%, 500=0.51%
cpu : usr=0.43%, sys=0.95%, ctx=123368, majf=0, minf=989
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=100.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.1%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued rwts: total=0,45995620,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=16
Run status group 0 (all jobs):
WRITE: bw=1496MiB/s (1569MB/s), 1496MiB/s-1496MiB/s
(1569MB/s-1569MB/s), io=175GiB (188GB), run=120098-120098msec
Disk stats (read/write):
nvme0n1: ios=190/45976809, merge=0/0, ticks=34/2374865,
in_queue=2374900, util=100.00%
Thanks
Kuai
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