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

From: Phil Ehrens
Subject: Re: [Qemu-discuss] Virtio-blk and trim
Date: Wed, 1 Oct 2014 13:56:37 -0700
User-agent: Mutt/1.5.22 (2013-10-16)

One could mount a physical disk partition, however, and then one would
presumably want to enable TRIM if the physical drive supported it.

Tony Su wrote:
>  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.
> Tony
> 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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