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Date: Wed, 24 May 2017 10:42:02 +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] c654f4e816: will-it-scale.per_thread_ops -5.8%
regression
Greeting,
FYI, we noticed a -5.8% regression of will-it-scale.per_thread_ops due to commit:
commit: c654f4e8165061a92787f89f1ad3f3bda6145cbf ("rcu: Eliminate NOCBs CPU-state Kconfig options")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2017.05.16b
in testcase: will-it-scale
on test machine: 16 threads Intel(R) Atom(R) CPU 3958 @ 2.00GHz with 64G memory
with following parameters:
nr_task: 100%
mode: thread
test: open2
cpufreq_governor: performance
test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two.
test-url: https://github.com/antonblanchard/will-it-scale
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: will-it-scale/100%-thread-open2-performance/lkp-denverton2
c69340bed57c7834 c654f4e8165061a92787f89f1a
---------------- --------------------------
88481 -6% 83356 will-it-scale.per_thread_ops
1473 7% 1579 will-it-scale.time.percent_of_cpu_this_job_got
4352 7% 4670 will-it-scale.time.system_time
29405 -5% 28035 vmstat.system.in
28907 -8% 26689 vmstat.system.cs
:4 100% 4:4 kmsg.IP-Config:Reopening_network_devices
7161 ± 68% -4e+03 2774 ± 13% latency_stats.avg.max
0.59 0.60 perf-stat.branch-miss-rate%
0.31 29% 0.40 perf-stat.iTLB-load-miss-rate%
8.777e+09 22% 1.073e+10 perf-stat.iTLB-load-misses
0.30 -6% 0.28 perf-stat.ipc
2.847e+12 -6% 2.687e+12 perf-stat.iTLB-loads
8752041 -8% 8079422 perf-stat.context-switches
21.46 13% 24.31 perf-stat.cache-miss-rate%
8.921e+10 -13% 7.781e+10 perf-stat.cache-references
2.847e+12 -6% 2.686e+12 perf-stat.instructions
5.517e+11 -6% 5.186e+11 perf-stat.branch-instructions
324 -23% 250 perf-stat.instructions-per-iTLB-miss
3.261e+09 -4% 3.13e+09 perf-stat.branch-misses
will-it-scale.time.system_time
4700 ++----------O--O-----------------------------------------------------+
O OO O OO O O O OO O OO O OO O OO O O O O |
4650 ++ O |
4600 ++ |
| |
4550 ++ |
| |
4500 ++ |
| |
4450 ++ * *. * |
4400 *+ +: * : *. + : |
| **.* :.*. .*.**.*.* * : *.*.* **.* *.*. * * |
4350 ++ * **.* *.*.* + : *.* + .* + .**.*
| * * * |
4300 ++-------------------------------------------------------------------+
will-it-scale.time.percent_of_cpu_this_job_got
1600 ++-------------------------------------------------------------------+
| |
1580 O+OO O OO O OO O O OO O OO O OO O OO O O O O |
| O |
1560 ++ |
| |
1540 ++ |
| |
1520 ++ |
| |
1500 ++ .* *. .* |
*. .* : .*. * .* *. .* *. * |
1480 ++** *.*.* .*.*.** **. .**. + *.* ** *. .**. .* + *.*
| * * * * * *.* |
1460 ++-------------------------------------------------------------------+
[*] 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-rc1-00086-gc654f4e" of type "text/plain" (159043 bytes)
View attachment "job-script" of type "text/plain" (6891 bytes)
View attachment "job.yaml" of type "text/plain" (4485 bytes)
View attachment "reproduce" of type "text/plain" (136 bytes)
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