how to setup nvme pci-pasthrough to get close to native performance?

1 May 2019

      Dear Openstack community,

I am configuring a high performance storage vms, I decided to go to the easy path (pci-passthrough), I can spin up vms and see the pci devices, however performance is below native/bare metal.

Native/Bare metal performance:

[root@zeus-54 data]# fio --ioengine=libaio --name=test --filename=test --bs=4k --size=40G --readwrite=randrw --runtime=120 --time_based

test: (g=0): rw=randrw, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1

fio-3.1

Starting 1 process

Jobs: 1 (f=1): [f(1)][100.0%][r=39.5MiB/s,w=39.6MiB/s][r=10.1k,w=10.1k IOPS][eta 00m:00s]

test: (groupid=0, jobs=1): err= 0: pid=50892: Wed May  1 22:22:45 2019

   read: IOPS=9805, BW=38.3MiB/s (40.2MB/s)(4596MiB/120001msec)

    slat (usec): min=39, max=6678, avg=94.72, stdev=55.78

    clat (nsec): min=450, max=18224, avg=525.83, stdev=120.10

     lat (usec): min=39, max=6679, avg=95.36, stdev=55.79

    clat percentiles (nsec):

     |  1.00th=[  462],  5.00th=[  478], 10.00th=[  482], 20.00th=[  486],

     | 30.00th=[  490], 40.00th=[  494], 50.00th=[  502], 60.00th=[  510],

     | 70.00th=[  516], 80.00th=[  532], 90.00th=[  596], 95.00th=[  676],

     | 99.00th=[  860], 99.50th=[ 1048], 99.90th=[ 1384], 99.95th=[ 2480],

     | 99.99th=[ 3728]

   bw (  KiB/s): min=  720, max=40736, per=100.00%, avg=39389.00, stdev=5317.58, samples=239

   iops        : min=  180, max=10184, avg=9847.23, stdev=1329.39, samples=239

  write: IOPS=9799, BW=38.3MiB/s (40.1MB/s)(4594MiB/120001msec)

    slat (nsec): min=2982, max=106207, avg=4220.09, stdev=980.04

    clat (nsec): min=407, max=18130, avg=451.48, stdev=103.71

     lat (usec): min=3, max=111, avg= 4.74, stdev= 1.03

    clat percentiles (nsec):

     |  1.00th=[  414],  5.00th=[  418], 10.00th=[  422], 20.00th=[  430],

     | 30.00th=[  434], 40.00th=[  434], 50.00th=[  438], 60.00th=[  438],

     | 70.00th=[  442], 80.00th=[  446], 90.00th=[  462], 95.00th=[  588],

     | 99.00th=[  700], 99.50th=[  916], 99.90th=[ 1208], 99.95th=[ 1288],

     | 99.99th=[ 3536]

   bw (  KiB/s): min=  752, max=42608, per=100.00%, avg=39366.63, stdev=5355.73, samples=239

   iops        : min=  188, max=10652, avg=9841.64, stdev=1338.93, samples=239

  lat (nsec)   : 500=69.98%, 750=28.64%, 1000=0.90%

  lat (usec)   : 2=0.42%, 4=0.04%, 10=0.01%, 20=0.01%

  cpu          : usr=2.20%, sys=10.85%, ctx=1176675, majf=0, minf=1372

  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     issued rwt: total=1176625,1175958,0, short=0,0,0, dropped=0,0,0

     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):

   READ: bw=38.3MiB/s (40.2MB/s), 38.3MiB/s-38.3MiB/s (40.2MB/s-40.2MB/s), io=4596MiB (4819MB), run=120001-120001msec

  WRITE: bw=38.3MiB/s (40.1MB/s), 38.3MiB/s-38.3MiB/s (40.1MB/s-40.1MB/s), io=4594MiB (4817MB), run=120001-120001msec

Disk stats (read/write):

  nvme9n1: ios=1174695/883620, merge=0/0, ticks=105502/72225, in_queue=192101, util=99.28%

VM performance:

[centos@kudu-1 nvme0]$ sudo fio --ioengine=libaio --name=test --filename=test --bs=4k --size=40G --readwrite=randrw --runtime=120 --time_based

test: (g=0): rw=randrw, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1

fio-3.1

Starting 1 process

Jobs: 1 (f=1): [m(1)][100.0%][r=29.2MiB/s,w=29.7MiB/s][r=7487,w=7595 IOPS][eta 00m:00s]

test: (groupid=0, jobs=1): err= 0: pid=44383: Wed May  1 12:22:24 2019

   read: IOPS=6994, BW=27.3MiB/s (28.6MB/s)(3278MiB/120000msec)

    slat (usec): min=54, max=20476, avg=115.27, stdev=71.45

    clat (nsec): min=1757, max=31476, avg=2163.02, stdev=688.66

     lat (usec): min=56, max=20481, avg=118.51, stdev=71.66

    clat percentiles (nsec):

     |  1.00th=[ 1800],  5.00th=[ 1832], 10.00th=[ 1864], 20.00th=[ 1992],

     | 30.00th=[ 2040], 40.00th=[ 2064], 50.00th=[ 2064], 60.00th=[ 2096],

     | 70.00th=[ 2096], 80.00th=[ 2128], 90.00th=[ 2480], 95.00th=[ 2544],

     | 99.00th=[ 4448], 99.50th=[ 5536], 99.90th=[11072], 99.95th=[12736],

     | 99.99th=[18560]

   bw (  KiB/s): min=  952, max=31224, per=100.00%, avg=28153.51, stdev=4126.89, samples=237

   iops        : min=  238, max= 7806, avg=7038.23, stdev=1031.70, samples=237

  write: IOPS=6985, BW=27.3MiB/s (28.6MB/s)(3274MiB/120000msec)

    slat (usec): min=7, max=963, avg=12.60, stdev= 6.24

    clat (nsec): min=1662, max=199250, avg=2030.26, stdev=712.33

     lat (usec): min=10, max=970, avg=15.68, stdev= 6.48

    clat percentiles (nsec):

     |  1.00th=[ 1688],  5.00th=[ 1720], 10.00th=[ 1736], 20.00th=[ 1864],

     | 30.00th=[ 1928], 40.00th=[ 1944], 50.00th=[ 1944], 60.00th=[ 1960],

     | 70.00th=[ 1960], 80.00th=[ 1992], 90.00th=[ 2352], 95.00th=[ 2384],

     | 99.00th=[ 4048], 99.50th=[ 4768], 99.90th=[11456], 99.95th=[13120],

     | 99.99th=[19072]

   bw (  KiB/s): min=  912, max=31880, per=100.00%, avg=28119.64, stdev=4176.38, samples=237

   iops        : min=  228, max= 7970, avg=7029.75, stdev=1044.07, samples=237

  lat (usec)   : 2=51.56%, 4=47.17%, 10=1.03%, 20=0.22%, 50=0.01%

  lat (usec)   : 250=0.01%

  cpu          : usr=4.96%, sys=28.37%, ctx=839307, majf=0, minf=26

  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     issued rwt: total=839283,838268,0, short=0,0,0, dropped=0,0,0

     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):

   READ: bw=27.3MiB/s (28.6MB/s), 27.3MiB/s-27.3MiB/s (28.6MB/s-28.6MB/s), io=3278MiB (3438MB), run=120000-120000msec

  WRITE: bw=27.3MiB/s (28.6MB/s), 27.3MiB/s-27.3MiB/s (28.6MB/s-28.6MB/s), io=3274MiB (3434MB), run=120000-120000msec

Disk stats (read/write):

  nvme0n1: ios=838322/651596, merge=0/0, ticks=83804/22119, in_queue=104773, util=70.18%

This is my Openstack rocky configuration:

nova.conf on controller node
[pci]
alias = { "vendor_id":"10de", "product_id":"1db1", "device_type":"type-PCI", "name":"nv_v100" }
alias = { "vendor_id":"8086", "product_id":"0953", "device_type":"type-PCI", "name":"nvme"}

nova.conf on compute node:

[pci]
passthrough_whitelist = [ {"address":"0000:84:00.0"}, {"address":"0000:85:00.0"}, {"address":"0000:86:00.0"}, {"address":"0000:87:00.0"} ]
alias = { "vendor_id":"8086", "product_id":"0953", "device_type":"type-PCI", "name":"nvme"}

This is how the nvmes are exposed to the vm
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x86' slot='0x00' function='0x0'/>
      </source>
      <alias name='hostdev1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </hostdev>

Guest OS is centos 7.6 so I am guessing nvme drivers are included.

Any help about what needs to my configuration to get close to native io performance?

Thank you very much

Manuel

From: Manuel Sopena Ballesteros [mailto:manuel.sb@garvan.org.au]
Sent: Wednesday, May 1, 2019 10:31 PM
To: openstack-discuss@lists.openstack.org
Subject: how to get best io performance from my block devices

Dear Openstack community,

I would like to have a high performance distributed database running in Openstack vms. I tried attaching dedicated nvme pci devices to the vm but the performance is not as good as I can get from bare metal.

Bare metal:

[root@zeus-54 data]# fio --ioengine=libaio --name=test --filename=test --bs=4k --size=40G --readwrite=randrw --runtime=120 --time_based

test: (g=0): rw=randrw, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1

fio-3.1

Starting 1 process

Jobs: 1 (f=1): [f(1)][100.0%][r=39.5MiB/s,w=39.6MiB/s][r=10.1k,w=10.1k IOPS][eta 00m:00s]

test: (groupid=0, jobs=1): err= 0: pid=50892: Wed May  1 22:22:45 2019

   read: IOPS=9805, BW=38.3MiB/s (40.2MB/s)(4596MiB/120001msec)

    slat (usec): min=39, max=6678, avg=94.72, stdev=55.78

    clat (nsec): min=450, max=18224, avg=525.83, stdev=120.10

     lat (usec): min=39, max=6679, avg=95.36, stdev=55.79

    clat percentiles (nsec):

     |  1.00th=[  462],  5.00th=[  478], 10.00th=[  482], 20.00th=[  486],

     | 30.00th=[  490], 40.00th=[  494], 50.00th=[  502], 60.00th=[  510],

     | 70.00th=[  516], 80.00th=[  532], 90.00th=[  596], 95.00th=[  676],

     | 99.00th=[  860], 99.50th=[ 1048], 99.90th=[ 1384], 99.95th=[ 2480],

     | 99.99th=[ 3728]

   bw (  KiB/s): min=  720, max=40736, per=100.00%, avg=39389.00, stdev=5317.58, samples=239

   iops        : min=  180, max=10184, avg=9847.23, stdev=1329.39, samples=239

  write: IOPS=9799, BW=38.3MiB/s (40.1MB/s)(4594MiB/120001msec)

    slat (nsec): min=2982, max=106207, avg=4220.09, stdev=980.04

    clat (nsec): min=407, max=18130, avg=451.48, stdev=103.71

     lat (usec): min=3, max=111, avg= 4.74, stdev= 1.03

    clat percentiles (nsec):

     |  1.00th=[  414],  5.00th=[  418], 10.00th=[  422], 20.00th=[  430],

     | 30.00th=[  434], 40.00th=[  434], 50.00th=[  438], 60.00th=[  438],

     | 70.00th=[  442], 80.00th=[  446], 90.00th=[  462], 95.00th=[  588],

     | 99.00th=[  700], 99.50th=[  916], 99.90th=[ 1208], 99.95th=[ 1288],

     | 99.99th=[ 3536]

   bw (  KiB/s): min=  752, max=42608, per=100.00%, avg=39366.63, stdev=5355.73, samples=239

   iops        : min=  188, max=10652, avg=9841.64, stdev=1338.93, samples=239

  lat (nsec)   : 500=69.98%, 750=28.64%, 1000=0.90%

  lat (usec)   : 2=0.42%, 4=0.04%, 10=0.01%, 20=0.01%

  cpu          : usr=2.20%, sys=10.85%, ctx=1176675, majf=0, minf=1372

  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     issued rwt: total=1176625,1175958,0, short=0,0,0, dropped=0,0,0

     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):

   READ: bw=38.3MiB/s (40.2MB/s), 38.3MiB/s-38.3MiB/s (40.2MB/s-40.2MB/s), io=4596MiB (4819MB), run=120001-120001msec

  WRITE: bw=38.3MiB/s (40.1MB/s), 38.3MiB/s-38.3MiB/s (40.1MB/s-40.1MB/s), io=4594MiB (4817MB), run=120001-120001msec

Disk stats (read/write):

  nvme9n1: ios=1174695/883620, merge=0/0, ticks=105502/72225, in_queue=192101, util=99.28%
...
From vm:
[centos@kudu-1 nvme0]$ sudo fio --ioengine=libaio --name=test --filename=test --bs=4k --size=40G --readwrite=randrw --runtime=120 --time_based

test: (g=0): rw=randrw, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1

fio-3.1

Starting 1 process

Jobs: 1 (f=1): [m(1)][100.0%][r=29.2MiB/s,w=29.7MiB/s][r=7487,w=7595 IOPS][eta 00m:00s]

test: (groupid=0, jobs=1): err= 0: pid=44383: Wed May  1 12:22:24 2019

   read: IOPS=6994, BW=27.3MiB/s (28.6MB/s)(3278MiB/120000msec)

    slat (usec): min=54, max=20476, avg=115.27, stdev=71.45

    clat (nsec): min=1757, max=31476, avg=2163.02, stdev=688.66

     lat (usec): min=56, max=20481, avg=118.51, stdev=71.66

    clat percentiles (nsec):

     |  1.00th=[ 1800],  5.00th=[ 1832], 10.00th=[ 1864], 20.00th=[ 1992],

     | 30.00th=[ 2040], 40.00th=[ 2064], 50.00th=[ 2064], 60.00th=[ 2096],

     | 70.00th=[ 2096], 80.00th=[ 2128], 90.00th=[ 2480], 95.00th=[ 2544],

     | 99.00th=[ 4448], 99.50th=[ 5536], 99.90th=[11072], 99.95th=[12736],

     | 99.99th=[18560]

   bw (  KiB/s): min=  952, max=31224, per=100.00%, avg=28153.51, stdev=4126.89, samples=237

   iops        : min=  238, max= 7806, avg=7038.23, stdev=1031.70, samples=237

  write: IOPS=6985, BW=27.3MiB/s (28.6MB/s)(3274MiB/120000msec)

    slat (usec): min=7, max=963, avg=12.60, stdev= 6.24

    clat (nsec): min=1662, max=199250, avg=2030.26, stdev=712.33

     lat (usec): min=10, max=970, avg=15.68, stdev= 6.48

    clat percentiles (nsec):

     |  1.00th=[ 1688],  5.00th=[ 1720], 10.00th=[ 1736], 20.00th=[ 1864],

     | 30.00th=[ 1928], 40.00th=[ 1944], 50.00th=[ 1944], 60.00th=[ 1960],

     | 70.00th=[ 1960], 80.00th=[ 1992], 90.00th=[ 2352], 95.00th=[ 2384],

     | 99.00th=[ 4048], 99.50th=[ 4768], 99.90th=[11456], 99.95th=[13120],

     | 99.99th=[19072]

   bw (  KiB/s): min=  912, max=31880, per=100.00%, avg=28119.64, stdev=4176.38, samples=237

   iops        : min=  228, max= 7970, avg=7029.75, stdev=1044.07, samples=237

  lat (usec)   : 2=51.56%, 4=47.17%, 10=1.03%, 20=0.22%, 50=0.01%

  lat (usec)   : 250=0.01%

  cpu          : usr=4.96%, sys=28.37%, ctx=839307, majf=0, minf=26

  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 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=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     issued rwt: total=839283,838268,0, short=0,0,0, dropped=0,0,0

     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):

   READ: bw=27.3MiB/s (28.6MB/s), 27.3MiB/s-27.3MiB/s (28.6MB/s-28.6MB/s), io=3278MiB (3438MB), run=120000-120000msec

  WRITE: bw=27.3MiB/s (28.6MB/s), 27.3MiB/s-27.3MiB/s (28.6MB/s-28.6MB/s), io=3274MiB (3434MB), run=120000-120000msec

Disk stats (read/write):

  nvme0n1: ios=838322/651596, merge=0/0, ticks=83804/22119, in_queue=104773, util=70.18%

Is there a way I can get near bare metal performance from my nvme block devices?
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NOTICE
Please consider the environment before printing this email. This message and any attachments are intended for the addressee named and may contain legally privileged/confidential/copyright information. If you are not the intended recipient, you should not read, use, disclose, copy or distribute this communication. If you have received this message in error please notify us at once by return email and then delete both messages. We accept no liability for the distribution of viruses or similar in electronic communications. This notice should not be removed.