From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 603F5A046B for ; Tue, 20 Aug 2019 18:01:43 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 7A0091BEED; Tue, 20 Aug 2019 18:01:42 +0200 (CEST) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by dpdk.org (Postfix) with ESMTP id 42C4491 for ; Tue, 20 Aug 2019 18:01:40 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Aug 2019 09:01:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,408,1559545200"; d="scan'208";a="377827230" Received: from fmsmsx107.amr.corp.intel.com ([10.18.124.205]) by fmsmga005.fm.intel.com with ESMTP; 20 Aug 2019 09:01:39 -0700 Received: from fmsmsx117.amr.corp.intel.com ([169.254.3.69]) by fmsmsx107.amr.corp.intel.com ([169.254.6.225]) with mapi id 14.03.0439.000; Tue, 20 Aug 2019 09:01:39 -0700 From: "Wiles, Keith" To: "chanzk@m.scnu.edu.cn" CC: dev Thread-Topic: [dpdk-dev] Questions about DPDK IOAT driver Thread-Index: AQHVV3CMQCC5UDkTt0GyxepnIQ5WYQ== Date: Tue, 20 Aug 2019 16:01:38 +0000 Message-ID: <6A987753-967F-4628-9AD7-4F623C3DA88F@intel.com> References: <201908202035257614512@m.scnu.edu.cn> In-Reply-To: <201908202035257614512@m.scnu.edu.cn> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.251.2.8] Content-Type: text/plain; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [dpdk-dev] Questions about DPDK IOAT driver X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" > On Aug 20, 2019, at 7:35 AM, chanzk@m.scnu.edu.cn wrote: >=20 > Hello DPDK, > I am a postgraduate student from South China Normal University, Guangz= hou, China.=20 > I found that the IOAT driver was released in DPDK 19.08 for the first = time. At the same time, I noticed that the code of DPDK IOAT driver was sim= ilar to SPDK one. So there are some questions I would like to ask you. The = questions are as follows. >=20 > 1. What's the difference between SPDK IOAT driver and DPDK IOAT driver= ? The SPDK has it own IOAT driver today, but we are looking to have SPDK use = the DPDK IOAT driver in the future, but the SPDK folks can answer that ques= tion. The DPDK IOAT driver leveraged some of the code from the SPDK system = and this is why they look the same. > 2. I have an idea that apply DPDK lockless ring (struct rte_ring) to D= PDK IOAT ring so that multiple threads can enqueue copy request to the same= DPDK IOAT ring at the same time, is that work ? We have the Ring PMD which I think could be used on top of the IOAT driver,= but I would have to think about it more. What would be the design you had = in mind here? >=20 > At your convenience, would you please answer my questions? >=20 > Thank you !=20 > Wish you a good day ! >=20 > Regards, > Zhenke Chan >=20 >=20 Regards, Keith