From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NKXJV-0000aL-MJ for qemu-devel@nongnu.org; Tue, 15 Dec 2009 08:19:41 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1NKXJR-0000WZ-0V for qemu-devel@nongnu.org; Tue, 15 Dec 2009 08:19:41 -0500 Received: from [199.232.76.173] (port=35701 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NKXJQ-0000WS-RI for qemu-devel@nongnu.org; Tue, 15 Dec 2009 08:19:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:8473) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1NKXJQ-0002fo-Iu for qemu-devel@nongnu.org; Tue, 15 Dec 2009 08:19:36 -0500 Message-ID: <4B278CDD.1080907@redhat.com> Date: Tue, 15 Dec 2009 15:19:25 +0200 From: Avi Kivity MIME-Version: 1.0 Subject: Re: [Qemu-devel] approaches to 3D virtualisation References: <21d7e9970912111758m6805a24clca16f237624ffc59@mail.gmail.com> <200912141203.38494.paul@codesourcery.com> In-Reply-To: <200912141203.38494.paul@codesourcery.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paul Brook Cc: Dave Airlie , qemu-devel@nongnu.org On 12/14/2009 02:03 PM, Paul Brook wrote: > [3] Obviously if you emulate lame hardware like ne2k or IDE then > performance > will suck. However emulation of a high-end NIC of SCSI HBA should get within > spitting distance of virtio. > Practically the only difference performance-wise between virtio and high-end controllers is that the ring index is located in a chip register on real hardware, and in memory for virtio (plus hardware can ask virtio not to notify). Real hardware assumes guest->controller traffic is cheap, which isn't true for virtio/kvm. -- error compiling committee.c: too many arguments to function