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Date: Wed, 29 Nov 2017 22:03:12 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Rik van Riel <riel@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Mel Gorman <mgorman@...e.de>, Mike Galbraith <efault@....de>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp-robot] [sched/fair] 7d894e6e34: hackbench.throughput -16.7%
regression
Greeting,
FYI, we noticed a -16.7% regression of hackbench.throughput due to commit:
commit: 7d894e6e34a5cdd12309c7e4a3f830277ad4b7bf ("sched/fair: Simplify wake_affine() for the single socket case")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
in testcase: hackbench
on test machine: 8 threads Ivy Bridge with 16G memory
with following parameters:
nr_threads: 50%
mode: process
ipc: socket
cpufreq_governor: performance
test-description: Hackbench is both a benchmark and a stress test for the Linux kernel scheduler.
test-url: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/sched/cfs-scheduler/hackbench.c
Details are as below:
-------------------------------------------------------------------------------------------------->
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
testcase/path_params/tbox_group/run: hackbench/50%-process-socket-performance/lkp-ivb-d01
739294fb03f59040 7d894e6e34a5cdd12309c7e4a3
---------------- --------------------------
31562163 202% 95366243 hackbench.time.involuntary_context_switches
47004 -17% 39177 hackbench.throughput
740 756 hackbench.time.percent_of_cpu_this_job_got
187.33 11% 208.84 hackbench.time.user_time
232783 -16% 194702 hackbench.time.minor_page_faults
1.45e+08 146% 3.564e+08 hackbench.time.voluntary_context_switches
6.52 7% 7.00 boot-time.dhcp
3463 3525 turbostat.Avg_MHz
348391 131% 805061 vmstat.system.cs
53266 174% 145884 vmstat.system.in
:2 100% 2:2 dmesg.RIP:cpuidle_enter_state
20848095 -28% 14959141 ± 3% perf-stat.cpu-migrations
941616 -3% 910398 perf-stat.minor-faults
941616 -3% 910398 perf-stat.page-faults
2.129e+08 133% 4.954e+08 perf-stat.context-switches
14752.50 -54% 6857.15 perf-stat.instructions-per-iTLB-miss
2.203e+12 -4% 2.113e+12 perf-stat.branch-instructions
1.021e+10 -56% 4.464e+09 perf-stat.cache-misses
0.74 -8% 0.68 perf-stat.ipc
1.138e+09 -42% 6.576e+08 ± 3% perf-stat.iTLB-loads
1.245e+13 -5% 1.179e+13 perf-stat.instructions
1.161e+11 22% 1.411e+11 perf-stat.cache-references
3.765e+12 -6% 3.535e+12 perf-stat.dTLB-loads
8.209e+09 47% 1.203e+10 perf-stat.branch-misses
2.826e+12 -7% 2.617e+12 perf-stat.dTLB-stores
8.438e+08 104% 1.719e+09 perf-stat.iTLB-load-misses
8.80 -64% 3.16 perf-stat.cache-miss-rate%
0.37 53% 0.57 perf-stat.branch-miss-rate%
1.35 8% 1.46 perf-stat.cpi
42.57 70% 72.34 perf-stat.iTLB-load-miss-rate%
:2 50% 1:2 kmsg.DHCP/BOOTP:Ignoring_fragmented_reply
hackbench.throughput
48000 +-+-----------------------------------------------------------------+
47000 +-++.+..+.+.. .+.. + + +. .+ |
| + +. .. +..+.+.. .+ |
46000 +-+ + .+. |
45000 +-+ + |
| |
44000 +-+ |
43000 +-+ |
42000 +-+ |
| |
41000 +-+ |
40000 +-+ |
O O O O O O O O O O O O O O |
39000 +-+O O O O O O O O O O O O O O
38000 +-+-----------------------------------------------------------------+
perf-stat.cache-references
1.5e+11 +-+--------------------------------------------------------------+
O O O O O |
1.45e+11 +-+ O O O O O O O |
1.4e+11 +-O O O O O O O O O O |
| O O O O O O
1.35e+11 +-+ |
| |
1.3e+11 +-+ |
| |
1.25e+11 +-+ |
1.2e+11 +-+..+.+..+ +.. .+.+.+..+.+.. |
| + + +.+. .+.. + |
1.15e+11 +-+ + + +. .+.. + |
| + + |
1.1e+11 +-+--------------------------------------------------------------+
perf-stat.cache-misses
1.1e+10 +-+---------------------------------------------------------------+
| +..+. .. +..+ +. +..+. .+.. .+ |
1e+10 +-+ + +..+ .+.+. |
| + |
9e+09 +-+ |
| |
8e+09 +-+ |
| |
7e+09 +-+ |
| |
6e+09 +-+ |
| |
5e+09 +-+ O |
O O O O O O O O O O O O O O O O O O O O O O O
4e+09 +-+---------------------O--O-----------O--------------O-----------+
perf-stat.branch-misses
1.5e+10 +-+---------------------------------------------------------------+
| O O |
1.4e+10 +-+ |
1.3e+10 +-+ O O O O O O O O O |
O O O O O O O O O O |
1.2e+10 +-O O O O O O O
| |
1.1e+10 +-+ |
| |
1e+10 +-+ |
9e+09 +-+ |
| |
8e+09 +-+..+.+..+. .+.+..+.+.+..+.+..+.+..+.+..+.+.+..+ |
| +. |
7e+09 +-+---------------------------------------------------------------+
perf-stat.iTLB-load-misses
2e+09 +-+---------------------------------------------------------------+
| |
1.8e+09 O-+ O O O O O O O O O |
| O O O O O O O O O O O O O O O |
| O O O
1.6e+09 +-+ |
| |
1.4e+09 +-+ |
| |
1.2e+09 +-+ |
| |
| + |
1e+09 +-+ +.. + + |
| .+.+..+. + .+.+..+.+.. + +.. .+. .+ |
8e+08 +-+---------------------------------------------------------------+
perf-stat.context-switches
5.5e+08 +-+---------------------------------------------------------------+
O O O O O O O O O |
5e+08 +-O O O O O O O O O O O O O O O O O O O
4.5e+08 +-+ |
| |
4e+08 +-+ |
| |
3.5e+08 +-+ |
| |
3e+08 +-+ |
2.5e+08 +-+ |
| |
2e+08 +-+..+.+..+.+..+.+..+.+.+..+.+..+.+..+.+..+.+.+..+ |
| |
1.5e+08 +-+---------------------------------------------------------------+
perf-stat.cache-miss-rate_
10 +-+--------------------------------------------------------------------+
| |
9 +-++.+.. .+. .+.+..+..+. .+.. .+.. .+..+..+.+..+..+ |
8 +-+ +. +. +. + + |
| |
7 +-+ |
| |
6 +-+ |
| |
5 +-+ |
4 +-+ |
| |
3 O-+O O O O O O O O O O O O O O O O O O O O O O O O O O O
| |
2 +-+--------------------------------------------------------------------+
perf-stat.branch-miss-rate_
0.7 +-+------------------------------------------------------------------+
| O O |
0.65 +-+ |
| O O O O |
0.6 +-+ O O O O O O O O O O |
O O O O O O O O O O O
0.55 +-+ O |
| |
0.5 +-+ |
| |
0.45 +-+ |
| |
0.4 +-+ |
|.. .+.. .+.. .+.+..+.. .+.. .+..+.+..+.+..+..+.+ |
0.35 +-+------------------------------------------------------------------+
perf-stat.instructions-per-iTLB-miss
16000 +-+-----------------------------------------------------------------+
15000 +-++.+.. .+.+ .+.. .+..+.+ |
| +.+. + +..+ + : +..+.+..+.+ |
14000 +-+ + + : : |
13000 +-+ + : : |
| + |
12000 +-+ |
11000 +-+ |
10000 +-+ |
| |
9000 +-+ |
8000 +-+ |
| |
7000 O-+O O O O O O O O O O O O O O O O O O O O O O O O O O O
6000 +-+-----------------------------------------------------------------+
hackbench.time.percent_of_cpu_this_job_got
760 +-+-----------------------O--O-----------O----------------------------+
O O O O O O O O O O O O |
| O O O O O O O O O O O
755 +-+ O O |
| |
| |
750 +-+ |
| |
745 +-+ |
|..+.+.. .+..+.+..+.+.. .+. .+.+ |
| +.+. +. +. + |
740 +-+ + .+..+.+..+ |
| +.+. |
| |
735 +-+-------------------------------------------------------------------+
hackbench.time.voluntary_context_switches
4e+08 +-+---------------------------------------------------------------+
O O O O O O O |
3.5e+08 +-O O O O O O O O O O O O O O O O O O O O O
| |
| |
3e+08 +-+ |
| |
2.5e+08 +-+ |
| |
2e+08 +-+ |
| |
| |
1.5e+08 +-+..+.+..+.+..+.+..+.+.+..+.+..+.+..+.+..+.+.+..+ |
| |
1e+08 +-+---------------------------------------------------------------+
hackbench.time.involuntary_context_switches
1.1e+08 +-+---------------------------------------------------------------+
O O O O O O O |
1e+08 +-O O O O O O O O O O O O O O O O O O O O O
9e+07 +-+ |
| |
8e+07 +-+ |
7e+07 +-+ |
| |
6e+07 +-+ |
5e+07 +-+ |
| |
4e+07 +-+ |
3e+07 +-+..+.+..+.+..+.+..+.+.+..+.+..+. .+.+..+.+.+..+ |
| +. |
2e+07 +-+---------------------------------------------------------------+
vmstat.system.in
160000 +-+-------------------------------------O--------------------------+
O O O O O O O O O O O O O O O O O O O O O
140000 +-+ O O O O O O |
| |
| |
120000 +-+ |
| |
100000 +-+ |
| |
80000 +-+ |
| |
| |
60000 +-+ .+..+.+..+. .+ |
|.+..+.+..+.+..+.+..+.+..+.+..+.+..+ +. |
40000 +-+----------------------------------------------------------------+
vmstat.system.cs
900000 +-+----------------------------------------------------------------+
O |
800000 +-O O O O O O O O O O O O O O O O O O O O O O O O O O O
| |
| |
700000 +-+ |
| |
600000 +-+ |
| |
500000 +-+ |
| |
| |
400000 +-+ |
|.+..+.+..+.+..+.+..+.+..+.+..+.+..+.+..+.+..+.+..+ |
300000 +-+----------------------------------------------------------------+
[*] bisect-good sample
[O] bisect-bad sample
Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.
Thanks,
Xiaolong
View attachment "config-4.12.0-rc6-00259-g7d894e6" of type "text/plain" (160117 bytes)
View attachment "job.yaml" of type "text/plain" (4396 bytes)
View attachment "reproduce" of type "text/plain" (1710 bytes)
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