From owner-freebsd-virtualization@freebsd.org  Mon Feb  6 11:43:36 2017
Return-Path: <owner-freebsd-virtualization@freebsd.org>
Delivered-To: freebsd-virtualization@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0CF18CD378E
 for <freebsd-virtualization@mailman.ysv.freebsd.org>;
 Mon,  6 Feb 2017 11:43:36 +0000 (UTC)
 (envelope-from bugzilla-noreply@freebsd.org)
Received: from kenobi.freebsd.org (kenobi.freebsd.org
 [IPv6:2001:1900:2254:206a::16:76])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id D6B791929
 for <freebsd-virtualization@FreeBSD.org>; Mon,  6 Feb 2017 11:43:35 +0000 (UTC)
 (envelope-from bugzilla-noreply@freebsd.org)
Received: from bugs.freebsd.org ([127.0.1.118])
 by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v16BhZn0079052
 for <freebsd-virtualization@FreeBSD.org>; Mon, 6 Feb 2017 11:43:35 GMT
 (envelope-from bugzilla-noreply@freebsd.org)
From: bugzilla-noreply@freebsd.org
To: freebsd-virtualization@FreeBSD.org
Subject: [Bug 216760] poor performance on QEMU-KVM host
Date: Mon, 06 Feb 2017 11:43:36 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 11.0-RELEASE
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: rainer@ultra-secure.de
X-Bugzilla-Status: New
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: ---
X-Bugzilla-Assigned-To: freebsd-virtualization@FreeBSD.org
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-216760-27103-Ym7Yc1sGfN@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-216760-27103@https.bugs.freebsd.org/bugzilla/>
References: <bug-216760-27103@https.bugs.freebsd.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: freebsd-virtualization@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "Discussion of various virtualization techniques FreeBSD supports."
 <freebsd-virtualization.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-virtualization>, 
 <mailto:freebsd-virtualization-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-virtualization/>
List-Post: <mailto:freebsd-virtualization@freebsd.org>
List-Help: <mailto:freebsd-virtualization-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization>, 
 <mailto:freebsd-virtualization-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 06 Feb 2017 11:43:36 -0000

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216760

--- Comment #4 from rainer@ultra-secure.de ---
Oh, I've never tried that.


(freebsd11 </root>) 0 # dc3dd wipe=3D/dev/md0=20

dc3dd 7.2.641 started at 2017-02-06 12:37:44 +0100
compiled options:
command line: dc3dd wipe=3D/dev/md0
device size: 8388608 sectors (probed),    4,294,967,296 bytes
sector size: 512 bytes (probed)
  4294967296 bytes ( 4 G ) copied ( 100% ),    8 s, 507 M/s=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20

input results for pattern `00':
   8388608 sectors in

output results for device `/dev/md0':
   8388608 sectors out

dc3dd completed at 2017-02-06 12:37:52 +0100


You're right, memory performance is still sufficient on XenServer.


This is real hardware:

root@bsd1-build-prod:~ # dc3dd wipe=3D/dev/md0

dc3dd 7.2.641 started at 2017-02-06 12:40:58 +0100
compiled options:
command line: dc3dd wipe=3D/dev/md0
device size: 8388608 sectors (probed),    4,294,967,296 bytes
sector size: 512 bytes (probed)
  4294967296 bytes ( 4 G ) copied ( 100% ),    6 s, 656 M/s=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20

input results for pattern `00':
   8388608 sectors in

output results for device `/dev/md0':
   8388608 sectors out

dc3dd completed at 2017-02-06 12:41:04 +0100

Though one generation later, so faster RAM, faster CPUs.

I'd be happy with that kind of disk-performance loss in a DomU :-(

--=20
You are receiving this mail because:
You are the assignee for the bug.=