From patchwork Sun May 29 08:11:34 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Wei W" X-Patchwork-Id: 9139639 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 9704760759 for ; Sun, 29 May 2016 00:20:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8869826E82 for ; Sun, 29 May 2016 00:20:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7D1C227F17; Sun, 29 May 2016 00:20:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=2.0 tests=BAYES_00, DATE_IN_FUTURE_06_12, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3134F26E82 for ; Sun, 29 May 2016 00:20:19 +0000 (UTC) Received: from localhost ([::1]:54512 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b6oSo-0007y9-9G for patchwork-qemu-devel@patchwork.kernel.org; Sat, 28 May 2016 20:20:18 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33445) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b6oOM-000452-51 for qemu-devel@nongnu.org; Sat, 28 May 2016 20:15:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b6oOH-0006ne-1h for qemu-devel@nongnu.org; Sat, 28 May 2016 20:15:42 -0400 Received: from mga01.intel.com ([192.55.52.88]:6080) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b6oOG-0006kP-Og for qemu-devel@nongnu.org; Sat, 28 May 2016 20:15:36 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 28 May 2016 17:15:36 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,381,1459839600"; d="scan'208";a="990754860" Received: from unknown (HELO otc18.sh.intel.com.com) ([10.239.48.138]) by fmsmga002.fm.intel.com with ESMTP; 28 May 2016 17:15:34 -0700 From: Wei Wang To: kvm@vger.kernel.org, qemu-devel@nongnu.org, virtio-comment@lists.oasis-open.org, mst@redhat.com, stefanha@redhat.com, pbonzini@redhat.com Date: Sun, 29 May 2016 16:11:34 +0800 Message-Id: <1464509494-159509-7-git-send-email-wei.w.wang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1464509494-159509-1-git-send-email-wei.w.wang@intel.com> References: <1464509494-159509-1-git-send-email-wei.w.wang@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.88 Subject: [Qemu-devel] [PATCH 6/6 Resend] Vhost-pci RFC: Experimental Results X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wei Wang Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Wei Wang --- Results | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 Results diff --git a/Results b/Results new file mode 100644 index 0000000..7402826 --- /dev/null +++ b/Results @@ -0,0 +1,18 @@ +We have built a fundamental vhost-pci based inter-VM communication framework +for network packet transmission. To test the throughput affected by scaling +with more VMs to stream out packets, we chain 2 to 5 VMs, and follow the vsperf +test methodology proposed by OPNFV, as shown in Fig. 2. The first VM is +passthrough-ed with a physical NIC to inject packets from an external packet +generator, and the last VM is passthrough-ed with a physical NIC to eject +packets back to the external generator. A layer2 forwarding module in each VM +is responsible for forwarding incoming packets from NIC1 (the injection NIC) to +NIC2 (the ejection NIC). In the traditional way, NIC2 is a virtio-net device +connected to the vhost-user backend in OVS. With our proposed solution, NIC2 is +a vhost-pci device, which directly copies packets to the next VM. The packet +generator implements the RFC2544 standard, which keeps running at a 0 packet +loss rate. + +Fig. 3 shows the scalability test results. In the vhost-user case, a +significant performance drop (40%~55%) occurs when 4 and 5 VMs are chained +together. The vhost-pci based inter-VM communication scales well (no +significant throughput drop) with more VMs are chained together.