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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
>
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>