From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from [140.186.70.92] (port=54964 helo=eggs.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1P2PS3-0003Qg-7z
	for qemu-devel@nongnu.org; Sun, 03 Oct 2010 10:22:08 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <avi@redhat.com>) id 1P2PS1-0003kN-Pg
	for qemu-devel@nongnu.org; Sun, 03 Oct 2010 10:22:07 -0400
Received: from mx1.redhat.com ([209.132.183.28]:18485)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <avi@redhat.com>) id 1P2PS1-0003kC-Eb
	for qemu-devel@nongnu.org; Sun, 03 Oct 2010 10:22:05 -0400
Message-ID: <4CA89185.6070302@redhat.com>
Date: Sun, 03 Oct 2010 16:21:57 +0200
From: Avi Kivity <avi@redhat.com>
MIME-Version: 1.0
References: <1285855312-11739-1-git-send-email-stefanha@linux.vnet.ibm.com>
	<4CA862A7.2080302@redhat.com> <20101003135138.GA19775@redhat.com>
In-Reply-To: <20101003135138.GA19775@redhat.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Subject: [Qemu-devel] Re: [PATCH] virtio: Use ioeventfd for virtqueue notify
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: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Steve Dobbelstein <steved@us.ibm.com>, Anthony Liguori <aliguori@us.ibm.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, kvm@vger.kernel.org, qemu-devel@nongnu.org, Khoa Huynh <khoa@us.ibm.com>, Sridhar Samudrala <sri@us.ibm.com>

  On 10/03/2010 03:51 PM, Michael S. Tsirkin wrote:
> On Sun, Oct 03, 2010 at 01:01:59PM +0200, Avi Kivity wrote:
> >  >
> >  >Guest to Host TCP_STREAM throughput(Mb/sec)
> >  >-------------------------------------------
> >  >Msg Size  vhost-net  virtio-net  virtio-net/ioeventfd
> >  >65536         12755        6430                  7590
> >  >16384          8499        3084                  5764
> >  >   4096          4723        1578                  3659
> >  >   1024          1827         981                  2060
> >
> >  Even more impressive (expected since the copying, which isn't
> >  present for block, is now shunted off into an iothread).
> >
> >  On the last test you even exceeded vhost-net.  Any theories how/why?
> >
> >  Again, efficiency numbers would be interesting.
> >
> >  >Host to Guest TCP_STREAM throughput(Mb/sec)
> >  >-------------------------------------------
> >  >Msg Size  vhost-net  virtio-net  virtio-net/ioeventfd
> >  >65536         11156        5790                  5853
> >  >16384         10787        5575                  5691
> >  >   4096         10452        5556                  4277
> >  >   1024          4437        3671                  5277
> >
> >  Here you exceed vhost-net, too.
>
> This is with small packets- I suspect this is the extra
> per interrupt overhead  that eventfd has.

This is using eventfd as well.

-- 
error compiling committee.c: too many arguments to function