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 E9F2AA04B4; Fri, 8 Nov 2019 15:26:22 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id B75531C1C7; Fri, 8 Nov 2019 15:26:22 +0100 (CET) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id D94F01C132 for ; Fri, 8 Nov 2019 15:26:20 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Nov 2019 06:26:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,281,1569308400"; d="scan'208";a="377773602" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.96]) ([10.237.221.96]) by orsmga005.jf.intel.com with ESMTP; 08 Nov 2019 06:26:09 -0800 To: Vamsi Krishna Attunuru , "dev@dpdk.org" Cc: "thomas@monjalon.net" , Jerin Jacob Kollanukkaran , Kiran Kumar Kokkilagadda , "olivier.matz@6wind.com" , "anatoly.burakov@intel.com" , "arybchenko@solarflare.com" , "stephen@networkplumber.org" References: <20191021080324.10659-1-vattunuru@marvell.com> <20191105110416.8955-1-vattunuru@marvell.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [EXT] Re: [PATCH v12 0/2] add IOVA=VA mode support 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" >> Hi Vasim, Jerin, >> >> Overall looks good and I not getting any functional error but I am observing a >> huge performance drop with this update, 3.8Mpps to 0.7Mpps [1]. > > Hi Ferruh, > When it comes to actual kernel netdev test cases like iperf or any other use cases, there would not be any impact on performance. I think synthetic test case like loopback mode might not be the actual test case alone to depend on when the kernel module is featured to work with kind of devices(pdev or vdev). Users can always fallback to pa mode with cmd line option. > > Please suggest your thoughts on considering what test case to use & evaluate the performance difference. Hi Vasim, I also assume the real life test cases will be affected less, but the loopback performance testing is good to show performance impact of the change. (Stephen's predictions that KNI is not as fast as tun/tap are getting more real by time J) At least I think the possible performance drop and how to mitigate it should be documented both in release notes and kni documentation. For the final decision, I am not objecting it but I would like to see more ack from community to confirm that we trade off iova=va functionality against performance. @Jerin, @Thomas, should we conclude this in techboard? Perhaps we can get it for rc2 and drop it back if rejected in techboard? Regards, ferruh