From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753823AbcBWOka (ORCPT ); Tue, 23 Feb 2016 09:40:30 -0500 Received: from szxga01-in.huawei.com ([58.251.152.64]:49974 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752765AbcBWOjy (ORCPT ); Tue, 23 Feb 2016 09:39:54 -0500 From: Ding Tianhong Subject: Ask some help for the performance of Intel 82599 on Linux 4.1.15 To: Jeff Kirsher , , , Carolyn Wyborny , "Don Skidmore" , , , , , , "linux-kernel@vger.kernel.org" Message-ID: <56CC6F20.4000202@huawei.com> Date: Tue, 23 Feb 2016 22:39:28 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.22.246] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090205.56CC6F26.00F1,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 99bce2735b2c2a3134f4511738ae47a8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jeff: I use the Intel 82599 to run benchmark on my machine, the kernel version is 4.1.15, and I found that when I run a single iperf by one port, the speed looks fine, it could run to 9.45Gb/s, it looks good. the command is: iperf -c 15.1.1.1 -t 100 -i 1 But when I run double iperf by two port from one single 82599 card, it looks strange, the speed could only up the 6Gb/s + 6Gb/s = 12Gb/s, the total speed is not twice as much than one port, I try to modify some param for tcp windows, it looks no effect, can you give me more suggestion? Thanks Ding