From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <dev-bounces@dpdk.org> Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id AEB7BA3160 for <public@inbox.dpdk.org>; Fri, 11 Oct 2019 16:22:10 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 7F6181EAF1; Fri, 11 Oct 2019 16:22:10 +0200 (CEST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 932D51EAEA for <dev@dpdk.org>; Fri, 11 Oct 2019 16:22:08 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id EB1E62DD43; Fri, 11 Oct 2019 14:22:07 +0000 (UTC) Received: from [10.36.112.48] (ovpn-112-48.ams2.redhat.com [10.36.112.48]) by smtp.corp.redhat.com (Postfix) with ESMTPS id EF4175D9CA; Fri, 11 Oct 2019 14:22:05 +0000 (UTC) To: Marvin Liu <yong.liu@intel.com>, tiwei.bie@intel.com, zhihong.wang@intel.com, stephen@networkplumber.org, gavin.hu@arm.com Cc: dev@dpdk.org References: <20190925171329.63734-1-yong.liu@intel.com> <20191009133849.69002-1-yong.liu@intel.com> <20191009133849.69002-4-yong.liu@intel.com> From: Maxime Coquelin <maxime.coquelin@redhat.com> Autocrypt: addr=maxime.coquelin@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: <20191009133849.69002-4-yong.liu@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Fri, 11 Oct 2019 14:22:08 +0000 (UTC) Subject: Re: [dpdk-dev] [PATCH v4 03/14] vhost: add batch enqueue function for packed ring X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> On 10/9/19 3:38 PM, Marvin Liu wrote: > Batch enqueue function will first check whether descriptors are cache > aligned. It will also check prerequisites in the beginning. Batch > enqueue function not support chained mbufs, single packet enqueue > function will handle it. > > Signed-off-by: Marvin Liu <yong.liu@intel.com> > Thinking again about this patch and series in general... So this series improves performance by 40% in cases where: - descriptors are cache aligned - single mbuf But my understanding is that it will cause performance regression for the other cases, which may not be that uncommon, no? Do you have some number about the performance impact on these other cases? Thanks, Maxime