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Date: Tue, 25 Oct 2016 14:46:47 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Alex Thorlton <athorlton@....com>
Cc: linux-kernel@...r.kernel.org, Alex Thorlton <athorlton@....com>,
Mike Travis <travis@....com>, Russ Anderson <rja@....com>,
Dimitri Sivanich <sivanich@....com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Matt Fleming <matt@...eblueprint.co.uk>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
x86@...nel.org, lkp@...org
Subject: [lkp] [x86/platform/UV] 71854cb812: will-it-scale.per_thread_ops
-2.3% regression
FYI, we noticed a -2.3% regression of will-it-scale.per_thread_ops due to commit:
commit 71854cb812ec23bfe5f63d52217e6b9e6cb901f5 ("x86/platform/UV: Fix support for EFI_OLD_MEMMAP after BIOS callback updates")
https://github.com/0day-ci/linux Alex-Thorlton/x86-platform-UV-Fix-support-for-EFI_OLD_MEMMAP-after-BIOS-callback-updates/20161020-095215
in testcase: will-it-scale
on test machine: 12 threads Intel(R) Core(TM) i7 CPU X 980 @ 3.33GHz with 6G memory
with following parameters:
test: read2
cpufreq_governor: performance
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.
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.
Details are as below:
-------------------------------------------------------------------------------------------------->
To reproduce:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase:
gcc-6/performance/x86_64-rhel-7.2/debian-x86_64-2016-08-31.cgz/wsm/read2/will-it-scale
commit:
v4.9-rc1
71854cb812 ("x86/platform/UV: Fix support for EFI_OLD_MEMMAP after BIOS callback updates")
v4.9-rc1 71854cb812ec23bfe5f63d5221
---------------- --------------------------
fail:runs %reproduction fail:runs
| | |
%stddev %change %stddev
\ | \
1646359 ± 0% -2.3% 1608758 ± 1% will-it-scale.per_thread_ops
981.11 ± 0% +2.3% 1003 ± 0% will-it-scale.time.system_time
81.90 ± 0% -27.5% 59.34 ± 0% will-it-scale.time.user_time
4679 ± 88% -43.4% 2649 ± 7% cpuidle.C1E-NHM.usage
76734 ± 21% -22.4% 59544 ± 4% softirqs.RCU
0.29 ± 2% +32.2% 0.38 ± 2% perf-stat.branch-miss-rate%
2.953e+09 ± 2% +31.1% 3.871e+09 ± 2% perf-stat.branch-misses
183791 ± 10% +15.1% 211493 ± 7% sched_debug.cpu.avg_idle.stddev
0.00 ± 11% +24.6% 0.00 ± 3% sched_debug.cpu.next_balance.stddev
13311 ± 12% +23.7% 16466 ± 1% sched_debug.cpu.ttwu_count.min
will-it-scale.time.user_time
85 ++---------------------------------------------------------------------+
| .*.*.. .*..*. .*..*. .*.. .*..*. .* |
80 *+ *.*..* *..* *..*..* * *..*.*. |
| |
| |
75 ++ |
| |
70 ++ |
| |
65 ++ |
| |
| O O |
60 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 |
55 ++---------------------------------------------------------------------+
will-it-scale.time.system_time
1010 ++-------------------------------------------------------------------+
| |
1005 ++ 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 O |
1000 ++ |
| |
995 ++ |
| |
990 ++ |
| |
| |
985 ++ |
*. .*..*.*.. .*.*.. .*.*..*. .*.. .*.*..*. |
980 ++*--*---------*-*-------*-*---------*----*-*---------*--------------+
[*] bisect-good sample
[O] bisect-bad sample
Thanks,
Xiaolong
View attachment "config-4.9.0-rc1-00001-g71854cb" of type "text/plain" (153709 bytes)
View attachment "job-script" of type "text/plain" (6449 bytes)
View attachment "job.yaml" of type "text/plain" (4032 bytes)
View attachment "reproduce" of type "text/plain" (139 bytes)
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