From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33874) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c4S6o-0006jX-4X for qemu-devel@nongnu.org; Wed, 09 Nov 2016 07:36:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c4S6j-000078-06 for qemu-devel@nongnu.org; Wed, 09 Nov 2016 07:36:06 -0500 Received: from indium.canonical.com ([91.189.90.7]:41102) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1c4S6i-00006z-QG for qemu-devel@nongnu.org; Wed, 09 Nov 2016 07:36:00 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.76 #1 (Debian)) id 1c4S6h-0003mW-IL for ; Wed, 09 Nov 2016 12:35:59 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id F0B6A2E81DB for ; Wed, 9 Nov 2016 12:35:55 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 09 Nov 2016 12:18:41 -0000 From: Louis Bouchard Reply-To: Bug 1546445 <1546445@bugs.launchpad.net> Sender: bounces@canonical.com References: <20160217094237.24220.45325.malonedeb@chaenomeles.canonical.com> Message-Id: <20161109121842.29461.23461.launchpad@wampee.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1546445] Re: support vhost user without specifying vhostforce List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org ** Tags removed: sts-sru -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1546445 Title: support vhost user without specifying vhostforce Status in Ubuntu Cloud Archive: Fix Released Status in Ubuntu Cloud Archive kilo series: Fix Released Status in QEMU: Fix Released Status in qemu package in Ubuntu: Fix Released Status in qemu source package in Wily: Fix Released Bug description: [Impact] * vhost-user falls back to virtio-net which causes performance lose without specifying the vhostforce option. But it should be the default behavior for vhost-user, since guests using PMD doesn't support msi-x. [Test Case] create a vhost-user virtio backend without specifying the vhostforce op= tion, i.e. -netdev type=3Dvhost-user,id=3Dmynet1,chardev=3D start the VM vhost-user is not enabled [Regression Potential] * none vhost user nic doesn't support non msi guests(like pxe stage) by default. Vhost user nic can't fall back to qemu like normal vhost net nic does. So= we should enable it for non msi guests. The problem has been fix in qemu upstream - http://git.qemu.org/?p=3Dqemu.git;a=3Dcommitdiff;h=3D24f938a682d934b13386= 3eb421aac33592f7a09e. And the patch needs to be backported to 1:2.2+dfsg-5expubuntu9.8 . To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-archive/+bug/1546445/+subscriptions