From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:44119)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <p.fedin@samsung.com>) id 1Yptyg-0004pL-DH
	for qemu-devel@nongnu.org; Wed, 06 May 2015 03:42:47 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <p.fedin@samsung.com>) id 1Yptyb-0008Td-ET
	for qemu-devel@nongnu.org; Wed, 06 May 2015 03:42:46 -0400
Received: from mailout3.w1.samsung.com ([210.118.77.13]:12479)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <p.fedin@samsung.com>) id 1Yptyb-0008T8-5a
	for qemu-devel@nongnu.org; Wed, 06 May 2015 03:42:41 -0400
Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244])
	by mailout3.w1.samsung.com
	(Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5
	2014)) with ESMTP id <0NNX002C7432NCA0@mailout3.w1.samsung.com> for
	qemu-devel@nongnu.org; Wed, 06 May 2015 08:42:38 +0100 (BST)
Received: from fedinw7x64 ([106.109.131.169])
	by eusync3.samsung.com (Oracle Communications Messaging Server
	7.0.5.31.0 64bit (built May  5 2014))
	with ESMTPA id <0NNX002F7432P430@eusync3.samsung.com> for
	qemu-devel@nongnu.org; Wed, 06 May 2015 08:42:38 +0100 (BST)
From: Pavel Fedin <p.fedin@samsung.com>
Date: Wed, 06 May 2015 10:42:32 +0300
Message-id: <000501d087d0$39c1bd90$ad4538b0$@samsung.com>
MIME-version: 1.0
Content-type: text/plain; charset=us-ascii
Content-transfer-encoding: 7bit
Content-language: ru
Subject: [Qemu-devel] [PATCH 0/4] Introduce eventfd support for virtio-mmio
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/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: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org

 Hello!

 I have updated and successfully tested an old patch set introducing eventfd
support for virtio-mmio, enabling to use vhost-net with it:
https://lists.gnu.org/archive/html/qemu-devel/2014-02/msg00715.html
 I would like to upstream it, since virtio-mmio is still there. I know that
some of you consider it deprecated, however i believe this is not entirely
true. Because you can add it to machine models which are not supposed to
have PCI (like vexpress).
 An old patch set relied on additional "eventfd" option in order to disable
the support if not implemented in kernel. My version simply checks
kvm_eventfds_enabled() for this purpose, so backwards compatibility is much
better.
 I confirm that this solution significantly improves the network performance
even without using irqfd.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia