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Re: [Qemu-discuss] Virtio-blk and trim

From: Tony Su
Subject: Re: [Qemu-discuss] Virtio-blk and trim
Date: Wed, 1 Oct 2014 13:24:08 -0700

 I don't know that it makes any sense to run a TRIM/discard function
in a virtual file system.
It only makes sense for the command to be applied directly to the disk
at the hardware I/O level.

So, if you run the command on your HostOS regularly, it should addres
the needs for all GuestOS as well as the HostOS.


On Wed, Oct 1, 2014 at 1:19 PM, George Shuklin <address@hidden> wrote:
> It's better to name it 'discard', because TRIM a very specific ATA command.
> It done completely different in SCSI and slightly different in SD cards. But
> linux call it 'discard', or, to be precise, BLKDISCARD (name of ioctl).
> On 10/01/2014 02:21 AM, Brian Rak wrote:
>> Are there any plans to bring trim support to Virtio-blk?  We've got a
>> couple things that would be made nicer by having working trim support.
>> I see that it's implemented in virtio-scsi, but there's a decent
>> performance hit for switching over to that.

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