Re: [Bug 1754542] Re: colo: vm crash with segmentation fault

[lee <1754542@bugs.launchpad.net>]

Hi Zhang Chen
I use sysbench compare Host、Qemu Native VM(virtio-blk)、Qemu Native VM、Qemu
colo disk performance.
The result in below attachment.
Qemu Native VM(virtio-blk) use -device virtio-blk-pci
Qemu colo follow https://wiki.qemu.org/Features/COLO
Thanks
Lee

Zhang Chen <zhangckid@gmail.com> 于2019年11月27日周三 上午11:15写道：

> Hi Lee,
>
> Can you introduce to me the detail test step about disk performance?
> I want to look into it when I have time.
>
> Thanks
> Zhang Chen
>
> On Wed, Nov 27, 2019 at 10:50 AM lee <1754542@bugs.launchpad.net> wrote:
> >
> > Hi Zhang Chen ,
> >
> > I try colo follow https://wiki.qemu.org/Features/COLO.
> > It work well. But disk performance slow.
> > Only host performance 10%.
> > Can virtio blk supported by current colo?
> > Or is there any other way to improve disk performance.
> >
> > Thanks
> > Zhang Chen
> >
> > --
> > You received this bug notification because you are subscribed to the bug
> > report.
> > https://bugs.launchpad.net/bugs/1754542
> >
> > Title:
> >   colo:  vm crash with segmentation fault
> >
> > Status in QEMU:
> >   Fix Released
> >
> > Bug description:
> >   I use Arch Linux x86_64
> >   Zhang Chen's(https://github.com/zhangckid/qemu/tree/qemu-colo-18mar10)
> >   Following document 'COLO-FT.txt',
> >   I test colo feature on my hosts
> >
> >   I run this command
> >   Primary:
> >   sudo /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -qmp
> stdio -name primary \
> >   -device piix3-usb-uhci \
> >   -device usb-tablet -netdev tap,id=hn0,vhost=off \
> >   -device virtio-net-pci,id=net-pci0,netdev=hn0 \
> >   -drive
> if=virtio,id=primary-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,\
> >   children.0.file.filename=/var/lib/libvirt/images/1.raw,\
> >   children.0.driver=raw -S
> >
> >   Secondary:
> >   sudo /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -qmp
> stdio -name secondary \
> >   -device piix3-usb-uhci \
> >   -device usb-tablet -netdev tap,id=hn0,vhost=off \
> >   -device virtio-net-pci,id=net-pci0,netdev=hn0 \
> >   -drive
> if=none,id=secondary-disk0,file.filename=/var/lib/libvirt/images/2.raw,driver=raw,node-name=node0
> \
> >   -drive if=virtio,id=active-disk0,driver=replication,mode=secondary,\
> >   file.driver=qcow2,top-id=active-disk0,\
> >   file.file.filename=/mnt/ramfs/active_disk.img,\
> >   file.backing.driver=qcow2,\
> >   file.backing.file.filename=/mnt/ramfs/hidden_disk.img,\
> >   file.backing.backing=secondary-disk0 \
> >   -incoming tcp:0:8888
> >
> >   Secondary:
> >   {'execute':'qmp_capabilities'}
> >   { 'execute': 'nbd-server-start',
> >     'arguments': {'addr': {'type': 'inet', 'data': {'host':
> '192.168.0.34', 'port': '8889'} } }
> >   }
> >   {'execute': 'nbd-server-add', 'arguments': {'device':
> 'secondary-disk0', 'writable': true } }
> >
> >   Primary:
> >   {'execute':'qmp_capabilities'}
> >   { 'execute': 'human-monitor-command',
> >     'arguments': {'command-line': 'drive_add -n buddy
> driver=replication,mode=primary,file.driver=nbd,file.host=192.168.0.34,file.port=8889,file.export=secondary-disk0,node-name=nbd_client0'}}
> >   { 'execute':'x-blockdev-change', 'arguments':{'parent':
> 'primary-disk0', 'node': 'nbd_client0' } }
> >   { 'execute': 'migrate-set-capabilities',
> >         'arguments': {'capabilities': [ {'capability': 'x-colo',
> 'state': true } ] } }
> >   { 'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.0.34:8888'
> } }
> >   And two VM with cash
> >   Primary:
> >   {"timestamp": {"seconds": 1520763655, "microseconds": 511415},
> "event": "RESUME"}
> >   [1]    329 segmentation fault  sudo /usr/local/bin/qemu-system-x86_64
> -boot c -enable-kvm -m 2048 -smp 2 -qm
> >
> >   Secondary:
> >   {"timestamp": {"seconds": 1520763655, "microseconds": 510907},
> "event": "RESUME"}
> >   [1]    367 segmentation fault  sudo /usr/local/bin/qemu-system-x86_64
> -boot c -enable-kvm -m 2048 -smp 2 -qm
> >
> > To manage notifications about this bug go to:
> > https://bugs.launchpad.net/qemu/+bug/1754542/+subscriptions
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1754542
>
> Title:
>   colo:  vm crash with segmentation fault
>
> Status in QEMU:
>   Fix Released
>
> Bug description:
>   I use Arch Linux x86_64
>   Zhang Chen's(https://github.com/zhangckid/qemu/tree/qemu-colo-18mar10)
>   Following document 'COLO-FT.txt',
>   I test colo feature on my hosts
>
>   I run this command
>   Primary:
>   sudo /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -qmp
> stdio -name primary \
>   -device piix3-usb-uhci \
>   -device usb-tablet -netdev tap,id=hn0,vhost=off \
>   -device virtio-net-pci,id=net-pci0,netdev=hn0 \
>   -drive
> if=virtio,id=primary-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,\
>   children.0.file.filename=/var/lib/libvirt/images/1.raw,\
>   children.0.driver=raw -S
>
>   Secondary:
>   sudo /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -qmp
> stdio -name secondary \
>   -device piix3-usb-uhci \
>   -device usb-tablet -netdev tap,id=hn0,vhost=off \
>   -device virtio-net-pci,id=net-pci0,netdev=hn0 \
>   -drive
> if=none,id=secondary-disk0,file.filename=/var/lib/libvirt/images/2.raw,driver=raw,node-name=node0
> \
>   -drive if=virtio,id=active-disk0,driver=replication,mode=secondary,\
>   file.driver=qcow2,top-id=active-disk0,\
>   file.file.filename=/mnt/ramfs/active_disk.img,\
>   file.backing.driver=qcow2,\
>   file.backing.file.filename=/mnt/ramfs/hidden_disk.img,\
>   file.backing.backing=secondary-disk0 \
>   -incoming tcp:0:8888
>
>   Secondary:
>   {'execute':'qmp_capabilities'}
>   { 'execute': 'nbd-server-start',
>     'arguments': {'addr': {'type': 'inet', 'data': {'host':
> '192.168.0.34', 'port': '8889'} } }
>   }
>   {'execute': 'nbd-server-add', 'arguments': {'device': 'secondary-disk0',
> 'writable': true } }
>
>   Primary:
>   {'execute':'qmp_capabilities'}
>   { 'execute': 'human-monitor-command',
>     'arguments': {'command-line': 'drive_add -n buddy
> driver=replication,mode=primary,file.driver=nbd,file.host=192.168.0.34,file.port=8889,file.export=secondary-disk0,node-name=nbd_client0'}}
>   { 'execute':'x-blockdev-change', 'arguments':{'parent': 'primary-disk0',
> 'node': 'nbd_client0' } }
>   { 'execute': 'migrate-set-capabilities',
>         'arguments': {'capabilities': [ {'capability': 'x-colo', 'state':
> true } ] } }
>   { 'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.0.34:8888' } }
>   And two VM with cash
>   Primary:
>   {"timestamp": {"seconds": 1520763655, "microseconds": 511415}, "event":
> "RESUME"}
>   [1]    329 segmentation fault  sudo /usr/local/bin/qemu-system-x86_64
> -boot c -enable-kvm -m 2048 -smp 2 -qm
>
>   Secondary:
>   {"timestamp": {"seconds": 1520763655, "microseconds": 510907}, "event":
> "RESUME"}
>   [1]    367 segmentation fault  sudo /usr/local/bin/qemu-system-x86_64
> -boot c -enable-kvm -m 2048 -smp 2 -qm
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1754542/+subscriptions
>


** Attachment added: "Qemu Host vs Qemu Native VM vs Qemu colo.xlsx"
   https://bugs.launchpad.net/bugs/1754542/+attachment/5308083/+files/Qemu%20Host%20vs%20Qemu%20Native%20VM%20vs%20Qemu%20colo.xlsx

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https://bugs.launchpad.net/bugs/1754542

Title:
  colo:  vm crash with segmentation fault

Status in QEMU:
  Fix Released

Bug description:
  I use Arch Linux x86_64
  Zhang Chen's(https://github.com/zhangckid/qemu/tree/qemu-colo-18mar10)
  Following document 'COLO-FT.txt',
  I test colo feature on my hosts

  I run this command
  Primary:
  sudo /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -qmp stdio -name primary \
  -device piix3-usb-uhci \
  -device usb-tablet -netdev tap,id=hn0,vhost=off \
  -device virtio-net-pci,id=net-pci0,netdev=hn0 \
  -drive if=virtio,id=primary-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,\
  children.0.file.filename=/var/lib/libvirt/images/1.raw,\
  children.0.driver=raw -S

  Secondary:
  sudo /usr/local/bin/qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -qmp stdio -name secondary \
  -device piix3-usb-uhci \
  -device usb-tablet -netdev tap,id=hn0,vhost=off \
  -device virtio-net-pci,id=net-pci0,netdev=hn0 \
  -drive if=none,id=secondary-disk0,file.filename=/var/lib/libvirt/images/2.raw,driver=raw,node-name=node0 \
  -drive if=virtio,id=active-disk0,driver=replication,mode=secondary,\
  file.driver=qcow2,top-id=active-disk0,\
  file.file.filename=/mnt/ramfs/active_disk.img,\
  file.backing.driver=qcow2,\
  file.backing.file.filename=/mnt/ramfs/hidden_disk.img,\
  file.backing.backing=secondary-disk0 \
  -incoming tcp:0:8888

  Secondary:
  {'execute':'qmp_capabilities'}
  { 'execute': 'nbd-server-start',
    'arguments': {'addr': {'type': 'inet', 'data': {'host': '192.168.0.34', 'port': '8889'} } }
  }
  {'execute': 'nbd-server-add', 'arguments': {'device': 'secondary-disk0', 'writable': true } }

  Primary:
  {'execute':'qmp_capabilities'}
  { 'execute': 'human-monitor-command',
    'arguments': {'command-line': 'drive_add -n buddy driver=replication,mode=primary,file.driver=nbd,file.host=192.168.0.34,file.port=8889,file.export=secondary-disk0,node-name=nbd_client0'}}
  { 'execute':'x-blockdev-change', 'arguments':{'parent': 'primary-disk0', 'node': 'nbd_client0' } }
  { 'execute': 'migrate-set-capabilities',
        'arguments': {'capabilities': [ {'capability': 'x-colo', 'state': true } ] } }
  { 'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.0.34:8888' } }
  And two VM with cash
  Primary:
  {"timestamp": {"seconds": 1520763655, "microseconds": 511415}, "event": "RESUME"}
  [1]    329 segmentation fault  sudo /usr/local/bin/qemu-system-x86_64 -boot c -enable-kvm -m 2048 -smp 2 -qm

  Secondary:
  {"timestamp": {"seconds": 1520763655, "microseconds": 510907}, "event": "RESUME"}
  [1]    367 segmentation fault  sudo /usr/local/bin/qemu-system-x86_64 -boot c -enable-kvm -m 2048 -smp 2 -qm

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1754542/+subscriptions