From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758407Ab2CFSYA (ORCPT ); Tue, 6 Mar 2012 13:24:00 -0500 Received: from g5t0008.atlanta.hp.com ([15.192.0.45]:43937 "EHLO g5t0008.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755949Ab2CFSX7 (ORCPT ); Tue, 6 Mar 2012 13:23:59 -0500 Message-ID: <4F56563C.2070206@hp.com> Date: Tue, 06 Mar 2012 10:23:56 -0800 From: Rick Jones User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.27) Gecko/20120216 Lightning/1.0b2 Thunderbird/3.1.19 MIME-Version: 1.0 To: Feng Tang CC: David Miller , alex.shi@intel.com, eric.dumazet@gmail.com, linux-kernel@vger.kernel.org, tim.c.chen@intel.com, ying.huang@intel.com, netdev@vger.kernel.org Subject: Re: TCP_STREAM performance regression on commit b3613118 References: <1329472239.2861.3.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> <20120217.133327.1178765872497293871.davem@davemloft.net> <1330656317.21053.1411.camel@debian> <20120301.220743.2174015405223036036.davem@davemloft.net> <20120306081117.GA17375@feng-i7> In-Reply-To: <20120306081117.GA17375@feng-i7> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/06/2012 12:11 AM, Feng Tang wrote: > On some machines, we found there is about 10% resgression of netperf > TCP-64K loopback test between 3.2 and 3.3-rc1. The exact test is: > ./netperf -t TCP_STREAM -l 60 -H 127.0.0.1 -i 50,3 -I 99,5 -- -s 32768 -S 32768 -m 4096 Side comment on the netperf command line. The maximum confidence interactions is silently capped at 30, so that might as well be "-i 30,3" http://www.netperf.org/svn/netperf2/tags/netperf-2.5.0/doc/netperf.html#index-g_t_002di_002c-Global-28 Also, for reproducibility, it might be desirable to pin netperf and netserver to a specific CPU or CPUs. That would be with a global -T option: http://www.netperf.org/svn/netperf2/tags/netperf-2.5.0/doc/netperf.html#index-g_t_002dT_002c-Global-41 happy benchmarking, rick jones