From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754634AbZHMNtv (ORCPT ); Thu, 13 Aug 2009 09:49:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753943AbZHMNtu (ORCPT ); Thu, 13 Aug 2009 09:49:50 -0400 Received: from moutng.kundenserver.de ([212.227.17.8]:58624 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753904AbZHMNtt (ORCPT ); Thu, 13 Aug 2009 09:49:49 -0400 From: Arnd Bergmann To: virtualization@lists.linux-foundation.org Subject: Re: [PATCH 2/2] vhost_net: a kernel-level virtio server Date: Thu, 13 Aug 2009 15:48:35 +0200 User-Agent: KMail/1.12.0 (Linux/2.6.31-5-generic; KDE/4.3.0; x86_64; ; ) Cc: "Michael S. Tsirkin" , netdev@vger.kernel.org, "Ira W. Snyder" , linux-kernel@vger.kernel.org, kvm@vger.kernel.org References: <20090813060615.GC3029@redhat.com> <200908131538.44465.arnd@arndb.de> In-Reply-To: <200908131538.44465.arnd@arndb.de> X-Face: I@=L^?./?$U,EK.)V[4*>`zSqm0>65YtkOe>TFD'!aw?7OVv#~5xd\s,[~w]-J!)|%=]> =?utf-8?q?+=0A=09=7EohchhkRGW=3F=7C6=5FqTmkd=5Ft=3FLZC=23Q-=60=2E=60Y=2Ea=5E?= =?utf-8?q?3zb?=) =?utf-8?q?+U-JVN=5DWT=25cw=23=5BYo0=267C=26bL12wWGlZi=0A=09=7EJ=3B=5Cwg?= =?utf-8?q?=3B3zRnz?=,J"CT_)=\H'1/{?SR7GDu?WIopm.HaBG=QYj"NZD_[zrM\Gip^U MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200908131548.35199.arnd@arndb.de> X-Provags-ID: V01U2FsdGVkX1+eZLTYg27rt8QREoMs9vJmlQuNgoKKcxTqxcB jEkRFetM3yq9RSrepBjyNsS5ycPoUdDHbOwiaj1X4dp/lW58Oy 169wQMuSY8D1SEYiA/HmA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 13 August 2009, Arnd Bergmann wrote: > Unfortunately, this also implies that you could no longer simply use the > packet socket interface as you do currently, as I realized only now. > This obviously has a significant impact on your user space interface. Also, if we do the copy in the transport, it definitely means that we can't get to zero-copy RX/TX from guest space any more. The current vhost_net driver doesn't do that yet, but could be extended in the same way that I'm hoping to do it for macvtap. Arnd <><