[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Thomas Huth]

** Changed in: qemu
   Status: Fix Committed => Fix Released

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Released

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Thomas Huth]

The DISCARD feature has now been implemented in QEMU, too:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=37b06f8d46fe602e630e4

** Changed in: qemu
   Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1523246

Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Fix Committed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Stefan Hajnoczi]

While the Linux virtio-blk guest driver now supports discard and write
zeroes, QEMU's virtio-blk device emulation does not support it yet.

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[James Harvey]

I believe this feature was just merged by Linus about a week ago, and is
in linux 5.0-rc1:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d548e65904ae43b0637d200a2441fc94e0589c30

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https://bugs.launchpad.net/bugs/1523246

Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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Re: [Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Jack Wang]

Latest effort was one month ago:

https://patchwork.kernel.org/patch/9645537/

2017-04-19 14:08 GMT+02:00 Mike Mol :
> discard support for virtio-blk is on the QEMU TODO list:
>
> http://wiki.qemu-project.org/ToDo/Block#virtio-
> blk_discard_support_.5BPeter_Lieven.5D
>
> --
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/1523246
>
> Title:
>   Virtio-blk does not support TRIM
>
> Status in QEMU:
>   Confirmed
>
> Bug description:
>   When model=virtio is used, TRIM is not supported.
>
>   # mount -o discard /dev/vda4 /mnt
>   # mount | tail -1
>   /dev/vda4 on /mnt type fuseblk 
> (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
>   # fstrim /mnt/
>   fstrim: /mnt/: the discard operation is not supported
>
>   Booting without model=virtio allows using TRIM (in Windows as well).
>
>   Full QEMU line:
>
>   qemu-system-x86_64 -enable-kvm -cpu host -bios
>   /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
>   -net nic,model=virtio -net user -drive discard=unmap,detect-
>   zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1523246/+subscriptions
>

[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Mike Mol]

discard support for virtio-blk is on the QEMU TODO list:

http://wiki.qemu-project.org/ToDo/Block#virtio-
blk_discard_support_.5BPeter_Lieven.5D

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https://bugs.launchpad.net/bugs/1523246

Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Mike Mol]

> Virtio will never support discard requests.

Why? If you don't want to write a treatise on the subject, perhaps point
at an LWN article or LKML thread where that conclusion was discussed or
reached.

> So, please rename bug to "Feature request: Refuse to operate if virtio
+ discard is requested"

Uh, if the feature as requested will never be satisfied, WONTFIX it and
create a feature that could be satisfied.  Or WONTFIX it and take no
further action. Either way, the status of things would be much clearer
to use poor schmucks who land here googling the issue.

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Mike Mol]

Granted, it's been there since October of 2014. http://wiki.qemu-
project.org/index.php?title=ToDo/Block=4410#virtio-
blk_discard_support_.5BPeter_Lieven.5D

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

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[Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM

[Rustam Abdullaev]

> Virtio will never support discard requests.

 - what is that?

> Please use virtio-scsi.

 - in some tests, SCSI emulation appears 7 times slower than the
paravirtualized bus.

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Title:
  Virtio-blk does not support TRIM

Status in QEMU:
  Confirmed

Bug description:
  When model=virtio is used, TRIM is not supported.

  # mount -o discard /dev/vda4 /mnt
  # mount | tail -1
  /dev/vda4 on /mnt type fuseblk 
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
  # fstrim /mnt/
  fstrim: /mnt/: the discard operation is not supported

  Booting without model=virtio allows using TRIM (in Windows as well).

  Full QEMU line:

  qemu-system-x86_64 -enable-kvm -cpu host -bios
  /usr/share/ovmf/ovmf_x64.bin -smp 2 -m 7G -vga qxl -usbdevice tablet
  -net nic,model=virtio -net user -drive discard=unmap,detect-
  zeroes=unmap,cache=none,file=vms/win10.hd.img.vmdk,format=vmdk,if=virtio

To manage notifications about this bug go to:
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