Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759954AbaGYIF6 (ORCPT ); Fri, 25 Jul 2014 04:05:58 -0400 Received: from mga01.intel.com ([192.55.52.88]:8141 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759878AbaGYIFy (ORCPT ); Fri, 25 Jul 2014 04:05:54 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,729,1400050800"; d="scan'208";a="567065622" Message-ID: <53D20FD0.90204@intel.com> Date: Fri, 25 Jul 2014 16:05:36 +0800 From: Aaron Lu MIME-Version: 1.0 To: Mike Galbraith CC: "Paul E. McKenney" , Jet Chen , LKML , lkp@01.org, Fengguang Wu Subject: Re: [LKP] [rcu] c0f489d2c6f: -1.5% netperf.Throughput_tps References: <53d1f486.t70cWJ/Ilm6Y3o5/%fengguang.wu@intel.com> <53D1FD0E.4080406@intel.com> <1406273721.5162.9.camel@marge.simpson.net> In-Reply-To: <1406273721.5162.9.camel@marge.simpson.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/25/2014 03:35 PM, Mike Galbraith wrote: > On Fri, 2014-07-25 at 14:45 +0800, Aaron Lu wrote: >> FYI, we noticed the below changes on >> >> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master >> commit c0f489d2c6fec8994c642c2ec925eb858727dc7b ("rcu: Bind grace-period kthreads to non-NO_HZ_FULL CPUs") >> >> abaa93d9e1de2c2 c0f489d2c6fec8994c642c2ec >> --------------- ------------------------- >> 12654 ~ 0% -1.5% 12470 ~ 0% ivb43/netperf/300s-25%-TCP_CRR >> 12654 ~ 0% -1.5% 12470 ~ 0% TOTAL netperf.Throughput_tps > > Out of curiosity, what parameters do you use for this test? In my The cmdline for this test is: netperf -t TCP_CRR -c -C -l 300 > piddling around with high frequency switching loads, they tend to have > too much build to build and boot to boot variance to track 1.5%. The actual results are not 100% stable, here is the values of the 5 runs: $ cat [0-4]/netperf.json { "netperf.Throughput_tps": [ 12674.061666666668 ] }{ "netperf.Throughput_tps": [ 12705.6325 ] }{ "netperf.Throughput_tps": [ 12621.97333333333 ] }{ "netperf.Throughput_tps": [ 12604.785000000002 ] }{ "netperf.Throughput_tps": [ 12664.158333333333 ] I suppose the way the stddev% is calculated by first calculating the average and then compare the individual value with the average. Fengguang, is this correct? Thanks, Aaron -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/