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Date: Thu, 25 May 2017 10:55:40 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Lauro Ramos Venancio <lvenanci@...hat.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
"H. Peter Anvin" <hpa@...or.com>, tipbuild@...or.com, lkp@...org
Subject: [lkp-robot] [sched/fair, cpumask] c743f0a5c5: hackbench.throughput
-24.9% regression
Greeting,
FYI, we noticed a -24.9% regression of hackbench.throughput due to commit:
commit: c743f0a5c50f2fcbc628526279cfa24f3dabe182 ("sched/fair, cpumask: Export for_each_cpu_wrap()")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git sched/core
in testcase: hackbench
on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G 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/01org/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-bdw-ep3
8c0334697dc37eb3 c743f0a5c50f2fcbc628526279
---------------- --------------------------
%stddev change %stddev
\ | \
179259 -25% 134695 ± 4% hackbench.throughput
825171 -23% 632917 ± 4% hackbench.time.minor_page_faults
1783 ± 3% 15% 2057 hackbench.time.user_time
1.596e+09 ± 5% 43% 2.286e+09 ± 6% hackbench.time.involuntary_context_switches
4.157e+09 ± 3% 16% 4.841e+09 hackbench.time.voluntary_context_switches
9066379 24% 11264639 ± 3% vmstat.system.cs
1.12 ± 4% 59% 1.78 ± 27% perf-stat.cache-miss-rate%
1.91e+10 ± 4% 23% 2.354e+10 ± 4% perf-stat.iTLB-load-misses
96.25 97.43 perf-stat.iTLB-load-miss-rate%
98.27 99.31 perf-stat.node-load-miss-rate%
72.92 -20% 58.24 ± 6% perf-stat.node-store-miss-rate%
2037986 -12% 1797391 perf-stat.minor-faults
2038044 -12% 1797391 perf-stat.page-faults
0.44 30% 0.57 perf-stat.branch-miss-rate%
1.707e+09 ± 11% 116% 3.693e+09 ± 28% perf-stat.node-stores
7.149e+10 27% 9.098e+10 ± 3% perf-stat.branch-misses
0.17 9% 0.18 perf-stat.dTLB-load-miss-rate%
5.778e+09 ± 4% 24% 7.148e+09 perf-stat.context-switches
4.118e+10 ± 3% 6% 4.366e+10 perf-stat.dTLB-load-misses
7.424e+08 -16% 6.203e+08 ± 5% perf-stat.iTLB-loads
2.933e+08 ± 22% 188% 8.443e+08 ± 18% perf-stat.cpu-migrations
4480 ± 3% -19% 3630 ± 4% perf-stat.instructions-per-iTLB-miss
1.843e+10 ± 6% 52% 2.797e+10 ± 25% perf-stat.cache-misses
8.35e+09 ± 8% 78% 1.49e+10 ± 27% perf-stat.node-load-misses
1.467e+08 ± 4% -34% 97529419 ± 9% perf-stat.node-loads
hackbench.time.minor_page_faults
950000 ++-----------------------------------------------------------------+
| .*. *. .*. *. .*. |
900000 *+*.* * : * * * *.*.* *.*.*.* * |
| + : : + : : : |
850000 ++ *. : : .* : : : |
| * * * *. .*.*.*.*.*.*.*.*
800000 ++ * |
| O O |
750000 ++ O O O O O O O OO |
| O |
700000 ++ O O O |
O O O O O |
650000 ++ |
| O O |
600000 ++-----------------------------------O-O-O-------------------------+
perf-stat.branch-misses
1e+11 ++-------------------O-----O--------------------------------------+
| O O O O O |
9.5e+10 ++ O OO O O O |
O O O O O O O |
9e+10 ++ O O O |
| O O |
8.5e+10 ++ |
| |
8e+10 ++ |
| |
7.5e+10 *+ * *.* *.*.* * * * |
|+ + + + : .*. + + + + + + + + .*. .*. .*.*
7e+10 ++*.* *.*.* *.* * *.* * *.* *.** *.*.* * |
| |
6.5e+10 ++----------------------------------------------------------------+
perf-stat.branch-miss-rate_
0.62 ++-------------------------------------------------------------------+
0.6 ++ O O |
| O O O O |
0.58 ++ O O O O O O O |
0.56 ++O O O O O O O O O O O |
O |
0.54 ++ |
0.52 ++ |
0.5 ++ |
| |
0.48 ++ |
0.46 ++ |
*. .*. .*.*. .*. .*. .*. .*. |
0.44 ++*.* *.*.*.*.*.*.* *.* *..* * *.* *.*.*.*.*.*.*.*.*.*.*
0.42 ++-------------------------------------------------------------------+
[*] 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-rc1-00015-gc743f0a" of type "text/plain" (159405 bytes)
View attachment "job-script" of type "text/plain" (6724 bytes)
View attachment "job.yaml" of type "text/plain" (4327 bytes)
View attachment "reproduce" of type "text/plain" (455 bytes)
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