Re: [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw
From: Fengguang Wu
Date: Wed Jun 04 2014 - 08:34:10 EST
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.
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 0 0 0 0 0 0
cpu105 0 0 1 72086 0 0 0 0 0 0
cpu106 66 0 363 71601 0 0 9 0 0 0
cpu107 2 0 4 72075 0 0 0 0 0 0
cpu108 0 0 2 72077 0 0 0 0 0 0
cpu109 0 0 8 72069 0 0 0 0 0 0
cpu110 0 0 1 72073 0 0 0 0 0 0
cpu111 0 0 9 72063 0 0 0 0 0 0
cpu112 0 0 1 72070 0 0 0 0 0 0
cpu113 0 0 0 72068 0 0 0 0 0 0
cpu114 0 0 1 72064 0 0 0 0 0 0
cpu115 0 0 1 72063 0 0 0 0 0 0
cpu116 0 0 1 72060 0 0 0 0 0 0
cpu117 0 0 0 72059 0 0 0 0 0 0
cpu118 0 0 0 72056 0 0 0 0 0 0
cpu119 0 0 1 72053 0 0 0 0 0 0
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ctxt 84441175
btime 1401871947
processes 23608
procs_running 2
procs_blocked 0
softirq 84702758 9 1574595 174 82369760 28 0 305 456968 84738 216181
Thanks,
Fengguang
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