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Date: Thu, 22 Apr 2021 22:42:58 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
Valentin Schneider <valentin.schneider@....com>,
LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
lkp@...ts.01.org, lkp@...el.com, ying.huang@...el.com,
feng.tang@...el.com, zhengjun.xing@...el.com,
aubrey.li@...ux.intel.com, yu.c.chen@...el.com
Subject: [sched,debug] 3b87f136f8: stress-ng.procfs.ops_per_sec -31.7%
regression
Greeting,
FYI, we noticed a -31.7% regression of stress-ng.procfs.ops_per_sec due to commit:
commit: 3b87f136f8fccddf7da016ab7d04bb3cf9b180f0 ("sched,debug: Convert sysctl sched_domains to debugfs")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git sched/core
in testcase: stress-ng
on test machine: 96 threads Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 192G memory
with following parameters:
nr_threads: 10%
disk: 1HDD
testtime: 60s
fs: ext4
class: os
test: procfs
cpufreq_governor: performance
ucode: 0x5003006
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
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 split-job --compatible job.yaml
bin/lkp run compatible-job.yaml
=========================================================================================
class/compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime/ucode:
os/gcc-9/performance/1HDD/ext4/x86_64-rhel-8.3/10%/debian-10.4-x86_64-20200603.cgz/lkp-csl-2sp5/procfs/stress-ng/60s/0x5003006
commit:
9af0440ec8 ("debugfs: Implement debugfs_create_str()")
3b87f136f8 ("sched,debug: Convert sysctl sched_domains to debugfs")
9af0440ec86ebdab 3b87f136f8fccddf7da016ab7d0
---------------- ---------------------------
%stddev %change %stddev
\ | \
16865 ± 4% -31.7% 11516 ± 6% stress-ng.procfs.ops
280.96 ± 4% -31.7% 191.86 ± 6% stress-ng.procfs.ops_per_sec
138362 ± 3% -21.1% 109140 ± 4% stress-ng.time.minor_page_faults
22050 ± 20% -31.6% 15085 ± 10% stress-ng.time.voluntary_context_switches
369981 -8.0% 340222 proc-vmstat.pgfault
16660 ±132% -87.9% 2014 ±139% softirqs.NET_RX
2736 ± 4% -8.1% 2513 ± 2% vmstat.system.cs
10101 ± 3% -11.7% 8915 ± 3% slabinfo.kmalloc-256.active_objs
10159 ± 3% -11.6% 8977 ± 3% slabinfo.kmalloc-256.num_objs
0.32 ± 30% -0.2 0.11 ± 23% perf-profile.children.cycles-pp._raw_spin_lock
0.21 ± 31% -0.2 0.06 ± 48% perf-profile.children.cycles-pp.do_sys_open
0.21 ± 31% -0.2 0.06 ± 48% perf-profile.children.cycles-pp.do_sys_openat2
0.21 ± 34% -0.2 0.06 ± 47% perf-profile.children.cycles-pp.do_filp_open
0.21 ± 34% -0.2 0.06 ± 47% perf-profile.children.cycles-pp.path_openat
5483 -8.0% 5042 perf-stat.i.minor-faults
5495 -8.0% 5055 perf-stat.i.page-faults
2520 ± 5% -7.8% 2323 ± 2% perf-stat.ps.context-switches
5344 -8.1% 4911 perf-stat.ps.minor-faults
5355 -8.1% 4922 perf-stat.ps.page-faults
550269 ± 4% -20.6% 436852 ± 4% interrupts.CAL:Function_call_interrupts
12293 ± 98% -80.9% 2349 ± 44% interrupts.CPU5.CAL:Function_call_interrupts
14886 ±104% -85.1% 2221 ± 60% interrupts.CPU5.TLB:TLB_shootdowns
17907 ± 68% -85.2% 2647 ± 56% interrupts.CPU53.CAL:Function_call_interrupts
21317 ± 71% -88.1% 2532 ± 74% interrupts.CPU53.TLB:TLB_shootdowns
10259 ± 67% -59.9% 4115 ± 71% interrupts.CPU62.CAL:Function_call_interrupts
12377 ± 72% -64.3% 4420 ± 86% interrupts.CPU62.TLB:TLB_shootdowns
615020 ± 5% -22.8% 474888 ± 4% interrupts.TLB:TLB_shootdowns
stress-ng.procfs.ops_per_sec
360 +---------------------------------------------------------------------+
340 |-+ + |
| :: |
320 |-+ : : |
300 |-+ : : |
|.+.+.+.+.+.+ +..+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+ +.+.+ |
280 |-+ + .. |
260 |-+ + |
240 |-+ |
| |
220 |-+ O O |
200 |-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 |
180 |-+ |
160 +---------------------------------------------------------------------+
[*] 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.
---
0DAY/LKP+ Test Infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation
Thanks,
Oliver Sang
View attachment "config-5.12.0-rc2-00059-g3b87f136f8fc" of type "text/plain" (172883 bytes)
View attachment "job-script" of type "text/plain" (8394 bytes)
View attachment "job.yaml" of type "text/plain" (5598 bytes)
View attachment "reproduce" of type "text/plain" (534 bytes)
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