From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zhihong.wang@intel.com>
Received: from mga07.intel.com (mga07.intel.com [134.134.136.100])
 by dpdk.org (Postfix) with ESMTP id B125F1B1B9
 for <dev@dpdk.org>; Thu,  2 Nov 2017 11:22:42 +0100 (CET)
Received: from orsmga004.jf.intel.com ([10.7.209.38])
 by orsmga105.jf.intel.com with ESMTP; 02 Nov 2017 03:22:41 -0700
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.44,333,1505804400"; d="scan'208";a="145079119"
Received: from fmsmsx107.amr.corp.intel.com ([10.18.124.205])
 by orsmga004.jf.intel.com with ESMTP; 02 Nov 2017 03:22:41 -0700
Received: from fmsmsx102.amr.corp.intel.com (10.18.124.200) by
 fmsmsx107.amr.corp.intel.com (10.18.124.205) with Microsoft SMTP Server (TLS)
 id 14.3.319.2; Thu, 2 Nov 2017 03:22:41 -0700
Received: from shsmsx101.ccr.corp.intel.com (10.239.4.153) by
 FMSMSX102.amr.corp.intel.com (10.18.124.200) with Microsoft SMTP Server (TLS)
 id 14.3.319.2; Thu, 2 Nov 2017 03:22:41 -0700
Received: from shsmsx103.ccr.corp.intel.com ([169.254.4.213]) by
 SHSMSX101.ccr.corp.intel.com ([169.254.1.159]) with mapi id 14.03.0319.002;
 Thu, 2 Nov 2017 18:22:38 +0800
From: "Wang, Zhihong" <zhihong.wang@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>, "Li, Xiaoyun" <xiaoyun.li@intel.com>
CC: "dev@dpdk.org" <dev@dpdk.org>, "Richardson, Bruce"
 <bruce.richardson@intel.com>, "Ananyev, Konstantin"
 <konstantin.ananyev@intel.com>, "Lu, Wenzhuo" <wenzhuo.lu@intel.com>,
 "Zhang, Helin" <helin.zhang@intel.com>, "ophirmu@mellanox.com"
 <ophirmu@mellanox.com>
Thread-Topic: [dpdk-dev] [PATCH v8 1/3] eal/x86: run-time dispatch over memcpy
Thread-Index: AQHTRAJGW94etdA280KAwpxgrNw23qLoDmwAgABTEQCAAENNgIABVbcAgABG0gCAAA7OAIAAC6cAgAAE2YCAAAKvgIAACCUAgAEEqYCACD4lgIAACHCAgAZg+YCABuUacA==
Date: Thu, 2 Nov 2017 10:22:37 +0000
Message-ID: <8F6C2BD409508844A0EFC19955BE0941513593EB@SHSMSX103.ccr.corp.intel.com>
References: <1507206794-79941-1-git-send-email-xiaoyun.li@intel.com>
 <B9E724F4CB7543449049E7AE7669D82F4816C5@SHSMSX101.ccr.corp.intel.com>
 <8258746.M4EytlN248@xps> <6811801.9Gdy4CqsrT@xps>
In-Reply-To: <6811801.9Gdy4CqsrT@xps>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
x-originating-ip: [10.239.127.40]
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Subject: Re: [dpdk-dev] [PATCH v8 1/3] eal/x86: run-time dispatch over memcpy
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Thu, 02 Nov 2017 10:22:44 -0000

> I don't know what is creating this drop exactly.
> When doing different tests on different environments, we do not see this
> drop.
> If nobody else can see such issue, I guess we can ignore it.

Hi Thomas, Xiaoyun,

With this patch (commit 84cc318424d49372dd2a5fbf3cf84426bf95acce) I see
more than 20% performance drop in vhost loopback test with testpmd
macswap for 256 bytes packets, which means it impacts actual vSwitching
performance.

Suggest we fix it or revert it for this release.

Thanks
Zhihong