From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 23CA091AC for ; Mon, 5 Oct 2015 15:39:52 +0200 (CEST) Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP; 05 Oct 2015 06:39:52 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,638,1437462000"; d="scan'208";a="574395572" Received: from fmsmsx108.amr.corp.intel.com ([10.18.124.206]) by FMSMGA003.fm.intel.com with ESMTP; 05 Oct 2015 06:39:51 -0700 Received: from fmsmsx154.amr.corp.intel.com (10.18.116.70) by FMSMSX108.amr.corp.intel.com (10.18.124.206) with Microsoft SMTP Server (TLS) id 14.3.248.2; Mon, 5 Oct 2015 06:39:51 -0700 Received: from shsmsx102.ccr.corp.intel.com (10.239.4.154) by FMSMSX154.amr.corp.intel.com (10.18.116.70) with Microsoft SMTP Server (TLS) id 14.3.248.2; Mon, 5 Oct 2015 06:39:51 -0700 Received: from shsmsx103.ccr.corp.intel.com ([169.254.4.246]) by shsmsx102.ccr.corp.intel.com ([169.254.2.179]) with mapi id 14.03.0248.002; Mon, 5 Oct 2015 21:39:49 +0800 From: "Xie, Huawei" To: Venkateswara Rao Dokku , Stephen Hemminger Thread-Topic: [dpdk-dev] Regarding MMIO Thread-Index: AQHQ/ADA8AjKYE+5wkW9ZfmG/DPCKw== Date: Mon, 5 Oct 2015 13:39:49 +0000 Message-ID: References: <20151001074228.6c980c96@urahara> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.237.221.74] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: "dev@dpdk.org" Subject: Re: [dpdk-dev] Regarding MMIO X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Oct 2015 13:39:53 -0000 On 10/5/2015 12:41 PM, Venkateswara Rao Dokku wrote:=0A= > Thanks for the response Stephen.=0A= >=0A= > Are you referring to Virt-IO 0.9 in specific here in the response or for= =0A= > any Virt-IO versions in general?=0A= >=0A= > On Thu, Oct 1, 2015 at 8:12 PM, Stephen Hemminger <=0A= > stephen@networkplumber.org> wrote:=0A= >=0A= >> On Thu, 1 Oct 2015 09:51:42 +0530=0A= >> Venkateswara Rao Dokku wrote:=0A= >>=0A= >>> Hi,=0A= >>>=0A= >>> If we go through the DPDK code it is observed that we are using MMIO fo= r=0A= >>> Virt-IO devices. But in the Virt-IO specification, it is written that= =0A= >> from=0A= >>> Virt-IO 1.0 onwards only they are supporting MMIO, all previous version= s=0A= >>> uses Port IO for RX/TX notifications.=0A= >>>=0A= >>> So, If I use VirtIO 0.9, Can I get the MMIO based notifications for RX/= TX=0A= >>> or is it supported only for Virt-IO 1.0 onwards?=0A= >>>=0A= >> Although the virtio device will bind to the mmio address in some cases,= =0A= >> it does not use that. It uses i/o port access (see iopl) to activate=0A= >> host.=0A= =0A= Which is used depends on access time. Check the virtio 1.0 improvement=0A= for mmio access.=0A= http://events.linuxfoundation.org/sites/events/files/slides/misha2015-v1.pd= f=0A= Is there any special reason you want to use mmio based notification?=0A= =0A= >=0A= >=0A= =0A=