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Date: Fri, 26 May 2017 15:03:18 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, lkp@...org
Subject: [lkp-robot] [rcu] d34303a1ef: unixbench.score -12.8% regression
Greeting,
FYI, we noticed a -12.8% regression of unixbench.score due to commit:
commit: d34303a1ef67e7e38e79d63d2b3aca1a12df3b37 ("rcu: Eliminate NOCBs CPU-state Kconfig options")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2017.05.25a
in testcase: unixbench
on test machine: 12 threads Intel(R) Atom(R) CPU 3958 @ 2.00GHz with 64G memory
with following parameters:
runtime: 300s
nr_task: 1
test: spawn
cpufreq_governor: performance
test-description: UnixBench is the original BYTE UNIX benchmark suite aims to test performance of Unix-like system.
test-url: https://github.com/kdlucas/byte-unixbench
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: unixbench/300s-1-spawn-performance/lkp-denverton3
6e74c237c410c0c7 d34303a1ef67e7e38e79d63d2b
---------------- --------------------------
%stddev change %stddev
\ | \
480 -13% 418 unixbench.score
3539621 -12% 3125335 unixbench.time.voluntary_context_switches
42363545 -14% 36485173 unixbench.time.minor_page_faults
176944 76% 311173 ± 3% interrupts.CAL:Function_call_interrupts
28259 4% 29287 vmstat.system.in
55147 -7% 51021 vmstat.system.cs
0 1e+04 9887 ±103% latency_stats.avg.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath
0 1e+04 9887 ±103% latency_stats.max.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath
0 1e+04 9887 ±103% latency_stats.sum.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath
2.99 45% 4.34 perf-stat.branch-miss-rate%
8.00 26% 10.06 perf-stat.cache-miss-rate%
2.881e+09 26% 3.619e+09 perf-stat.branch-misses
3.134e+09 22% 3.831e+09 perf-stat.cache-misses
0.04 ± 5% 13% 0.04 ± 3% perf-stat.iTLB-load-miss-rate%
18327237 -7% 16964457 perf-stat.context-switches
0.51 -11% 0.45 perf-stat.ipc
5.116e+11 -12% 4.489e+11 perf-stat.iTLB-loads
2550 ± 5% -13% 2223 ± 5% perf-stat.instructions-per-iTLB-miss
5.113e+11 -13% 4.436e+11 perf-stat.instructions
9.62e+10 -13% 8.335e+10 perf-stat.branch-instructions
42719474 -14% 36840024 perf-stat.minor-faults
42719477 -14% 36840026 perf-stat.page-faults
437104 ± 3% -26% 322992 ± 3% perf-stat.cpu-migrations
interrupts.CAL:Function_call_interrupts
450000 ++-----------------------------------------------------------------+
| |
400000 ++ O |
| |
| |
350000 ++O O O |
O O O O O O O O O O O |
300000 ++ O O O O O O |
| |
250000 ++ |
| * |
| + + |
200000 ++ .*.. + *..*. .*. .*. .*.. .*.. |
*.*..* *.*..*.* *..*.*. *. *..* * *.*..*.*..*.*
150000 ++-----------------------------------------------------------------+
perf-stat.instructions
5.3e+11 ++----------------------------------------------------------------+
5.2e+11 ++ *.. |
| *..*.*.. .*. + .*.. .*..*. .*
5.1e+11 ++ *.*..*.*. *.*.. .*..*.*..*.* * * *..* |
5e+11 *+ .*..* |
| * |
4.9e+11 ++ |
4.8e+11 ++ |
4.7e+11 ++ |
| O O |
4.6e+11 ++ O |
4.5e+11 ++ O O O O O |
O O O O O O O O |
4.4e+11 ++ O O O O O |
4.3e+11 ++----------------------------------------------------------------+
perf-stat.branch-instructions
1e+11 ++----------------------------------------------------------------+
9.8e+10 ++ *.. |
| *.. .*.. .*. + .*.. .*..*. .*
9.6e+10 ++ * *.*..*.*. *.*.. .*..*.*..*.* * * *..* |
9.4e+10 *+ .*..* |
| * |
9.2e+10 ++ |
9e+10 ++ |
8.8e+10 ++ |
| O O |
8.6e+10 ++ O O O O |
8.4e+10 O+ O O O O O O O |
| O O O O O |
8.2e+10 ++ O O |
8e+10 ++----------------------------------------------------------------+
perf-stat.iTLB-loads
5.3e+11 ++-----*---------------------*------------------------------------+
5.2e+11 ++ :+ * * |
| : + .*. .. + .*.*
5.1e+11 *+*.. : *.*..*.*. *.* *..*.*..*.*. .*.*..*.*.. .*. |
5e+11 ++ * *. * |
| |
4.9e+11 ++ |
4.8e+11 ++ |
4.7e+11 ++ |
| |
4.6e+11 ++ O O O |
4.5e+11 ++O O O O O O |
O O O O O O |
4.4e+11 ++ O O O O O O |
4.3e+11 ++----------------------------------------------------------------+
perf-stat.page-faults
4.4e+07 ++----------------------------------------------------------------+
| *. *.. |
4.3e+07 ++ .*. .*.*..*. .. *. .*..*. .*. .*.*. .*. + .*..*.*
4.2e+07 *+*. *. * *..* *. *. *. *..* * |
| |
4.1e+07 ++ |
4e+07 ++ |
| |
3.9e+07 ++ |
3.8e+07 ++ |
| |
3.7e+07 ++ O O O O O O O O |
3.6e+07 O+ O O O O O O O O O O |
| O O |
3.5e+07 ++----------------------------------------------------------------+
perf-stat.context-switches
1.95e+07 ++---------------------------------------------------------------+
| .* |
1.9e+07 ++ * : |
| + : |
| .*.. + : |
1.85e+07 *+*..* *.*.*..*. .*.*.* *. .*. .*.*.. .*. .*.. .*
| *. *. *.*. * *..* * |
1.8e+07 ++ |
| |
1.75e+07 ++ |
| |
| O |
1.7e+07 ++O O O O O O O O O O O O O O |
O O O O O O |
1.65e+07 ++---------------------------------------------------------------+
perf-stat.minor-faults
4.4e+07 ++----------------------------------------------------------------+
| *. *.. |
4.3e+07 ++ .*. .*.*..*. .. *. .*..*. .*. .*.*. .*. + .*..*.*
4.2e+07 *+*. *. * *..* *. *. *. *..* * |
| |
4.1e+07 ++ |
4e+07 ++ |
| |
3.9e+07 ++ |
3.8e+07 ++ |
| |
3.7e+07 ++ O O O O O O O O |
3.6e+07 O+ O O O O O O O O O O |
| O O |
3.5e+07 ++----------------------------------------------------------------+
perf-stat.branch-miss-rate_
4.6 ++--------------------------------------------------------------------+
4.4 ++ O |
| O O O O O |
4.2 ++ O O O O O O O O O O O O |
4 O+ O O |
| |
3.8 ++ |
3.6 ++ |
3.4 ++ |
| |
3.2 ++ .*. .*.. |
3 *+.*.*. *..*.. .*..*.*..*..* *..*.*..*..*. .* *..*.*..*.*..*
| * : + *. |
2.8 ++ : .* |
2.6 ++-----------------------------*--------------------------------------+
unixbench.score
490 ++-------------------*------------------------------------------------+
*..*.*..*.*.. .*. *..*..*.*..*.*..*.*..*.. .*..*.*..*.. .*.*..|
480 ++ *..* * *.*. *
470 ++ |
| |
460 ++ |
450 ++ |
| |
440 ++ |
430 ++ |
| |
420 ++ O O O O |
410 ++ O O O O O O O O O O O |
O O O O O O |
400 ++--------------------------------------------------------------------+
unixbench.time.minor_page_faults
4.4e+07 ++----------------------------------------------------------------+
| *.. |
4.3e+07 ++ .*. .*. .*. .*.* .*.. + .*.*
4.2e+07 *+*. *. *. *. + .* *.*..*.*..*.*.*..*.*..* *.*. |
| *. |
4.1e+07 ++ |
4e+07 ++ |
| |
3.9e+07 ++ |
3.8e+07 ++ |
| |
3.7e+07 ++ O O |
3.6e+07 O+ O O O O O O O O O O O O |
| O O O O O |
3.5e+07 ++O---------------------------------------------------------------+
unixbench.time.voluntary_context_switches
3.7e+06 ++----------------------------------------------------------------+
| |
3.6e+06 ++ .*.. .*..*. .*.. .*..*. |
|.*..* *.*..* * * *..*.*..*. .*..*.*..*. .*.*..*.|
3.5e+06 *+ * *. *
| |
3.4e+06 ++ |
| |
3.3e+06 ++ |
| |
3.2e+06 ++ |
| O O O |
3.1e+06 ++O O O O O O O O O O |
O O O O O O O O |
3e+06 ++----------------------------------------------------------------+
[*] 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-rc1-00084-gd34303a1" of type "text/plain" (159054 bytes)
View attachment "job-script" of type "text/plain" (6724 bytes)
View attachment "job.yaml" of type "text/plain" (4324 bytes)
View attachment "reproduce" of type "text/plain" (126 bytes)
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