Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751803AbZIUQVk (ORCPT ); Mon, 21 Sep 2009 12:21:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751529AbZIUQVj (ORCPT ); Mon, 21 Sep 2009 12:21:39 -0400 Received: from mail.vyatta.com ([76.74.103.46]:56639 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751190AbZIUQVi (ORCPT ); Mon, 21 Sep 2009 12:21:38 -0400 Date: Mon, 21 Sep 2009 09:21:30 -0700 From: Stephen Hemminger To: Rusty Russell Cc: virtualization@lists.linux-foundation.org, "Xin, Xiaohui" , "kvm@vger.kernel.org" , "mst@redhat.com" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "hpa@zytor.com" , "mingo@elte.hu" , "akpm@linux-foundation.org" Subject: Re: [RFC] Virtual Machine Device Queues(VMDq) support on KVM Message-ID: <20090921092130.30984dbd@s6510> In-Reply-To: <200909211637.23299.rusty@rustcorp.com.au> References: <20090901090518.1193e412@nehalam> <200909211637.23299.rusty@rustcorp.com.au> Organization: Vyatta X-Mailer: Claws Mail 3.6.1 (GTK+ 2.16.1; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 904 Lines: 18 On Mon, 21 Sep 2009 16:37:22 +0930 Rusty Russell wrote: > > > Actually this framework can apply to traditional network adapters which have > > > just one tx/rx queue pair. And applications using the same user/kernel interface > > > can utilize this framework to send/receive network traffic directly thru a tx/rx > > > queue pair in a network adapter. > > > More importantly, when virtualizations is used with multi-queue NIC's the virtio-net NIC is a single CPU bottleneck. The virtio-net NIC should preserve the parallelism (lock free) using multiple receive/transmit queues. The number of queues should equal the number of CPUs. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/