From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from [140.186.70.92] (port=39865 helo=eggs.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1OoLy0-0004HD-OO
	for qemu-devel@nongnu.org; Wed, 25 Aug 2010 15:49:02 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69)
	(envelope-from <anthony@codemonkey.ws>) id 1OoLxs-0002zZ-Mn
	for qemu-devel@nongnu.org; Wed, 25 Aug 2010 15:48:53 -0400
Received: from mail-qw0-f45.google.com ([209.85.216.45]:57922)
	by eggs.gnu.org with esmtp (Exim 4.69)
	(envelope-from <anthony@codemonkey.ws>) id 1OoLxs-0002zU-Kf
	for qemu-devel@nongnu.org; Wed, 25 Aug 2010 15:48:52 -0400
Received: by qwh5 with SMTP id 5so888744qwh.4
	for <qemu-devel@nongnu.org>; Wed, 25 Aug 2010 12:48:52 -0700 (PDT)
Message-ID: <4C7573A2.8030708@codemonkey.ws>
Date: Wed, 25 Aug 2010 14:48:50 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] qemu-kvm faster that qemu?
References: <i53ren$56d$1@dough.gmane.org>
In-Reply-To: <i53ren$56d$1@dough.gmane.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: walt <w41ter@gmail.com>
Cc: qemu-devel@nongnu.org

On 08/25/2010 02:37 PM, walt wrote:
> Hi qemu team,
>
> I just discovered that qemu now offers kvm support, so I decided to
> compare it to qemu-kvm.
>
> I'm running the latest git versions of both programs on an AMD64
> host running the latest kernel from Linus.git.
>
> The guest is Windows 7 on a qcow2 disk image and one kvm64 cpu.
>
> Using the same qcow2 image for both qemu and qemu-kvm, I find that
> qemu-kvm boots to the Win7 login prompt in 25 seconds, but qemu
> with kvm enabled takes about 45 seconds.


make sure you build qemu with --enable-io-thread.  Also, what's your 
full command line?

Regards,

Anthony Liguori

>
> Is this an expected outcome, or must I be doing something wrong
> with qemu?
>
> BTW, I tried reverting the qcow2 patch being discussed in another
> thread but it made no difference.  Perhaps there's not much writing
> to disk during bootup?
>
> Thanks!
>
>
>
>
>