From: Paolo Bonzini <pbonzini@redhat.com>
To: "Richard W.M. Jones" <rjones@redhat.com>
Cc: Teng-Feng Yang <shinrairis@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] TRIM/DISCARD/UNMAP support on qemu-nbd
Date: Tue, 07 Jan 2014 21:48:17 +0100 [thread overview]
Message-ID: <52CC6811.4000107@redhat.com> (raw)
In-Reply-To: <20140107202708.GB1273@redhat.com>
Il 07/01/2014 21:27, Richard W.M. Jones ha scritto:
> Not much more what I said in the original email (especially see the
> attached script which you can download from the bottom of this page:
> https://lists.gnu.org/archive/html/qemu-devel/2014-01/msg00084.html )
>
> Basically it tries to dd /dev/zero into the virtio-scsi device exposed
> by qemu, then calls sg_unmap (there are two devices, it only unmaps
> the first so we can hopefully see the difference), but it doesn't seem
> to have any effect on the underlying file. The underlying file is a
> regular raw-format file on ext4.
>
> I called sg_readcap/sg_vpd and we seem to have all the right
> capability bits exposed.
>
> This script won't work with regular libguestfs. I compiled a special
> appliance that had the sg tools included.
Try again with the pull request of
http://permalink.gmane.org/gmane.comp.emulators.qemu/248421
Paolo
next prev parent reply other threads:[~2014-01-07 20:48 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-30 11:58 [Qemu-devel] TRIM/DISCARD/UNMAP support on qemu-nbd Teng-Feng Yang
2014-01-02 16:15 ` Richard W.M. Jones
2014-01-07 14:48 ` Paolo Bonzini
2014-01-07 20:27 ` Richard W.M. Jones
2014-01-07 20:48 ` Paolo Bonzini [this message]
2014-01-07 21:22 ` Richard W.M. Jones
2014-01-08 22:11 ` Paolo Bonzini
2014-01-08 22:24 ` Richard W.M. Jones
2014-01-08 22:45 ` Paolo Bonzini
2014-01-08 22:53 ` Richard W.M. Jones
2014-01-09 7:02 ` Paolo Bonzini
2014-01-07 21:27 ` Richard W.M. Jones
2014-01-06 2:45 ` Stefan Hajnoczi
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