Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751945AbaFDWRK (ORCPT ); Wed, 4 Jun 2014 18:17:10 -0400 Received: from e37.co.us.ibm.com ([32.97.110.158]:35687 "EHLO e37.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751413AbaFDWRI convert rfc822-to-8bit (ORCPT ); Wed, 4 Jun 2014 18:17:08 -0400 Date: Wed, 4 Jun 2014 15:17:04 -0700 From: "Paul E. McKenney" To: Fengguang Wu Cc: Jet Chen , LKML , lkp@01.org Subject: Re: [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw Message-ID: <20140604221704.GH22231@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <538D9EA9.6070406@intel.com> <20140603141720.GN22231@linux.vnet.ibm.com> <20140604123338.GA1263@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: <20140604123338.GA1263@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14060422-7164-0000-0000-0000023B550A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 04, 2014 at 08:33:38PM +0800, Fengguang Wu wrote: > Hi Paul, > > On Tue, Jun 03, 2014 at 07:17:20AM -0700, Paul E. McKenney wrote: > > On Tue, Jun 03, 2014 at 06:08:41PM +0800, Jet Chen wrote: > > > Hi Paul, > > > > > > FYI, we noticed the below changes on > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/fixes > > > commit 5057f55e543b7859cfd26bc281291795eac93f8a ("rcu: Bind RCU grace-period kthreads if NO_HZ_FULL") > > > > My guess would be that some of these workloads generated enough callbacks > > that binding all the rcuo callback-offloading kthreads to CPU 0 resulted > > in a bottleneck. If that was the case, CPU 0 would often hit 100% > > CPU utilization, and there would be more wait time on other CPUs because > > callback execution was delayed. > > > > Does that match what you are seeing? > > This is the /proc/stat contents on completion of test > brickland3/qperf/600s. It shows that CPU 0 is not busy. Hmmm... Might be sometimes busy, thus blocking grace periods? I posted a speculative fix at a558e309f99cf8b809691417324c6770e10bb614, please let me know how it goes! Thanx, Paul > cpu 1707 0 57716 8569826 33 0 14572 0 0 0 > cpu0 2 0 575 69345 29 0 8 0 0 0 > cpu1 0 0 86 72203 3 0 1 0 0 0 > cpu2 116 0 386 71437 0 0 0 0 0 0 > > The columns of numbers are: > > - user: normal processes executing in user mode > - nice: niced processes executing in user mode > - system: processes executing in kernel mode > - idle: twiddling thumbs > - iowait: waiting for I/O to complete > - irq: servicing interrupts > - softirq: servicing softirqs > - steal: involuntary wait > - guest: running a normal guest > - guest_nice: running a niced guest > > cpu3 32 0 59 72213 0 0 0 0 0 0 > cpu4 8 0 35 72272 0 0 0 0 0 0 > cpu5 1 0 3 72318 0 0 0 0 0 0 > cpu6 1 0 3 72320 0 0 0 0 0 0 > cpu7 0 0 2 72327 0 0 0 0 0 0 > cpu8 0 0 2 72323 0 0 0 0 0 0 > cpu9 0 0 1 72323 0 0 0 0 0 0 > cpu10 0 0 2 72314 0 0 0 0 0 0 > cpu11 0 0 2 72317 0 0 0 0 0 0 > cpu12 0 0 3 72311 0 0 0 0 0 0 > cpu13 0 0 2 72313 0 0 0 0 0 0 > cpu14 0 0 20 72296 0 0 0 0 0 0 > cpu15 0 0 90 72192 0 0 1 0 0 0 > cpu16 0 0 13 72288 0 0 1 0 0 0 > cpu17 115 0 137 71848 0 0 0 0 0 0 > cpu18 28 0 32 72106 0 0 0 0 0 0 > cpu19 7 0 5 72256 0 0 0 0 0 0 > cpu20 2 0 72 71938 0 0 0 0 0 0 > cpu21 0 0 3 72273 0 0 0 0 0 0 > cpu22 0 0 2 72284 0 0 0 0 0 0 > cpu23 0 0 1 72284 0 0 0 0 0 0 > cpu24 0 0 2 72279 0 0 0 0 0 0 > cpu25 0 0 1 72281 0 0 0 0 0 0 > cpu26 0 0 2 72274 0 0 0 0 0 0 > cpu27 0 0 5 72274 0 0 0 0 0 0 > cpu28 0 0 22 72255 0 0 0 0 0 0 > cpu29 0 0 1 72273 0 0 0 0 0 0 > cpu30 24 0 748 70165 0 0 407 0 0 0 > cpu31 28 0 906 70251 0 0 465 0 0 0 > cpu32 62 0 2276 68376 0 0 604 0 0 0 > cpu33 27 0 1100 70059 0 0 453 0 0 0 > cpu34 23 0 1359 69933 0 0 418 0 0 0 > cpu35 32 0 1663 69109 0 0 775 0 0 0 > cpu36 103 0 8569 60806 0 0 2306 0 0 0 > cpu37 88 0 7052 63141 0 0 518 0 0 0 > cpu38 51 0 2881 67927 0 0 498 0 0 0 > cpu39 36 0 1705 69166 0 0 430 0 0 0 > cpu40 99 0 8657 60720 0 0 1767 0 0 0 > cpu41 103 0 7088 61185 0 0 1749 0 0 0 > cpu42 42 0 1567 69244 0 0 525 0 0 0 > cpu43 43 0 1661 68865 0 0 457 0 0 0 > cpu44 39 0 2610 68046 0 0 660 0 0 0 > cpu45 3 0 248 71852 0 0 30 0 0 0 > cpu46 4 0 16 72140 0 0 6 0 0 0 > cpu47 115 0 297 71435 0 0 159 0 0 0 > cpu48 30 0 81 71940 0 0 61 0 0 0 > cpu49 14 0 163 71815 0 0 118 0 0 0 > cpu50 6 0 144 71832 0 0 129 0 0 0 > cpu51 12 0 508 71217 0 0 276 0 0 0 > cpu52 18 0 498 71082 0 0 378 0 0 0 > cpu53 11 0 440 71236 0 0 282 0 0 0 > cpu54 4 0 205 71710 0 0 144 0 0 0 > cpu55 4 0 136 71898 0 0 78 0 0 0 > cpu56 13 0 400 71305 0 0 288 0 0 0 > cpu57 14 0 377 71346 0 0 316 0 0 0 > cpu58 2 0 109 71954 0 0 73 0 0 0 > cpu59 1 0 8 72174 0 0 3 0 0 0 > cpu60 0 0 0 72191 0 0 0 0 0 0 > cpu61 86 0 313 71749 0 0 0 0 0 0 > cpu62 3 0 9 72173 0 0 0 0 0 0 > cpu63 2 0 8 72175 0 0 0 0 0 0 > cpu64 0 0 2 72178 0 0 0 0 0 0 > cpu65 0 0 2 72177 0 0 0 0 0 0 > cpu66 0 0 2 72175 0 0 0 0 0 0 > cpu67 0 0 2 72173 0 0 0 0 0 0 > cpu68 0 0 4 72169 0 0 0 0 0 0 > cpu69 0 0 2 72168 0 0 0 0 0 0 > cpu70 0 0 1 72166 0 0 0 0 0 0 > cpu71 0 0 1 72164 0 0 0 0 0 0 > cpu72 0 0 0 72163 0 0 0 0 0 0 > cpu73 0 0 0 72161 0 0 0 0 0 0 > cpu74 0 0 1 72158 0 0 0 0 0 0 > cpu75 0 0 0 72156 0 0 0 0 0 0 > cpu76 73 0 330 71709 0 0 0 0 0 0 > cpu77 4 0 10 72137 0 0 0 0 0 0 > cpu78 1 0 4 72145 0 0 0 0 0 0 > cpu79 0 0 50 72077 0 0 0 0 0 0 > cpu80 0 0 5 72138 0 0 0 0 0 0 > cpu81 0 0 1 72141 0 0 0 0 0 0 > cpu82 0 0 66 72074 0 0 0 0 0 0 > cpu83 0 0 1 72137 0 0 0 0 0 0 > cpu84 0 0 0 72136 0 0 0 0 0 0 > cpu85 0 0 1 72133 0 0 0 0 0 0 > cpu86 0 0 0 72131 0 0 0 0 0 0 > cpu87 0 0 0 72129 0 0 0 0 0 0 > cpu88 0 0 1 72127 0 0 0 0 0 0 > cpu89 0 0 0 72124 0 0 0 0 0 0 > cpu90 0 0 0 72122 0 0 0 0 0 0 > cpu91 63 0 1377 70501 0 0 162 0 0 0 > cpu92 2 0 14 72100 0 0 0 0 0 0 > cpu93 1 0 5 72109 0 0 0 0 0 0 > cpu94 0 0 4 72108 0 0 0 0 0 0 > cpu95 1 0 4 72106 0 0 0 0 0 0 > cpu96 0 0 1 72106 0 0 0 0 0 0 > cpu97 0 0 0 72105 0 0 0 0 0 0 > cpu98 0 0 1 72102 0 0 0 0 0 0 > cpu99 0 0 2 72099 0 0 0 0 0 0 > cpu100 0 0 1 72099 0 0 0 0 0 0 > cpu101 0 0 0 72096 0 0 0 0 0 0 > cpu102 0 0 0 72094 0 0 0 0 0 0 > cpu103 0 0 1 72092 0 0 0 0 0 0 > cpu104 0 0 0 72089 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