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


From: Jack Wang
Subject: Re: [Qemu-devel] [Bug 1523246] Re: Virtio-blk does not support TRIM
Date: Wed, 19 Apr 2017 15:15:34 +0200

Latest effort was one month ago:

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

2017-04-19 14:08 GMT+02:00 Mike Mol <address@hidden>:
> 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
>



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