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Date: Wed, 29 Jun 2016 10:37:51 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp] [f2fs] b93f771286: aim7.jobs-per-min -81.2% regression
FYI, we noticed a -81.2% regression of aim7.jobs-per-min due to commit:
commit b93f7712868648c0529eed6b568cea1493d3d9f9 ("f2fs: remove writepages lock")
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
in testcase: aim7
on test machine: 48 threads Ivytown Ivy Bridge-EP with 64G memory
with following parameters: disk=4BRD_12G/fs=f2fs/load=600/md=RAID0/test=sync_disk_rw
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/disk/fs/kconfig/load/md/rootfs/tbox_group/test/testcase:
gcc-4.9/4BRD_12G/f2fs/x86_64-rhel/600/RAID0/debian-x86_64-2015-02-07.cgz/ivb44/sync_disk_rw/aim7
commit:
69e9e42744 ("f2fs: set flush_merge by default")
b93f771286 ("f2fs: remove writepages lock")
69e9e4274450c778 b93f7712868648c0529eed6b56
---------------- --------------------------
fail:runs %reproduction fail:runs
| | |
:4 50% 2:4 kmsg.Spurious_LAPIC_timer_interrupt_on_cpu
%stddev %change %stddev
\ | \
17539 ± 1% -81.2% 3303 ± 0% aim7.jobs-per-min
205.35 ± 1% +430.8% 1089 ± 0% aim7.time.elapsed_time
205.35 ± 1% +430.8% 1089 ± 0% aim7.time.elapsed_time.max
19225140 ± 1% +13.7% 21864211 ± 0% aim7.time.involuntary_context_switches
76889 ± 3% +73.4% 133360 ± 6% aim7.time.minor_page_faults
1169 ± 0% +484.6% 6835 ± 0% aim7.time.system_time
7.04 ± 1% +421.8% 36.75 ± 1% aim7.time.user_time
43519877 ± 0% +633.9% 3.194e+08 ± 0% aim7.time.voluntary_context_switches
aim7.jobs-per-min
20000 ++------------------------------------------------------------------+
| .*.. |
18000 *+*..*.*..* *.*.*..*. .*. .*.*.*.. .*..*.*..*.*.*..*. .*.*..*.*
16000 ++ *. *. * *. |
| |
14000 ++ |
12000 ++ |
| |
10000 ++ |
8000 ++ |
O O O O O O O O O O O O O |
6000 ++ |
4000 ++ |
| O O O O O O O O O O |
2000 ++------------------------------------------------------------------+
aim7.time.user_time
45 ++---------------------------------------------------------------------+
| O O |
40 ++ O O O O |
35 O+ O O O O O O O O O O O O O O O O |
| |
30 ++ |
| |
25 ++ |
| |
20 ++ |
15 ++ |
| |
10 ++ |
*..*.*..*.*.. .*..*.*..*.*..*.*..*.*..*.*..*
5 ++-----------*-*--*-*--*-*--*-*--*--*-*--*-----------------------------+
aim7.time.system_time
7000 ++------------------------------O--O-O-O--O-O--O----O-O--------------+
| O |
6000 ++ |
| |
| |
5000 ++ |
| |
4000 ++ |
| |
3000 O+O O O O O O O O O O O O |
| |
| |
2000 ++ |
*.*..*.*..*. .*.. .*..*.*..*.*..*. .*..*.*..*.*..*.*..*.*.. |
1000 ++----------*--*----*----------------*------------------------*-*--*-*
aim7.time.elapsed_time
1200 ++-------------------------------------------------------------------+
1100 ++ O O O O O O O O O |
| O |
1000 ++ |
900 ++ |
800 ++ |
700 ++ |
| |
600 ++ |
500 O+O O O O O O O O O O O O |
400 ++ |
300 ++ |
| .*.. |
200 *+*..*.*..*.*..*.*..*.*..*.*..*.*..*.*.*..*.*..*.*..*.*..* *.*..*.*
100 ++-------------------------------------------------------------------+
aim7.time.elapsed_time.max
1200 ++-------------------------------------------------------------------+
1100 ++ O O O O O O O O O |
| O |
1000 ++ |
900 ++ |
800 ++ |
700 ++ |
| |
600 ++ |
500 O+O O O O O O O O O O O O |
400 ++ |
300 ++ |
| .*.. |
200 *+*..*.*..*.*..*.*..*.*..*.*..*.*..*.*.*..*.*..*.*..*.*..* *.*..*.*
100 ++-------------------------------------------------------------------+
aim7.time.voluntary_context_switches
3.5e+08 ++----------------------------------------------------------------+
O O O O O O O O O O O O O O O O O O O O O O O |
3e+08 ++ |
| |
2.5e+08 ++ |
| |
2e+08 ++ |
| |
1.5e+08 ++ |
| |
1e+08 ++ |
| |
5e+07 *+*..*.*.*..*.*..*.*.*..*.*.*..*.*.*..*.*.*..*.*..*.*.*..*.*.*..*.*
| |
0 ++----------------------------------------------------------------+
[*] bisect-good sample
[O] bisect-bad sample
Thanks,
Xiaolong
View attachment "config-4.7.0-rc1-00135-gb93f771" of type "text/plain" (150952 bytes)
View attachment "job.yaml" of type "text/plain" (3176 bytes)
View attachment "reproduce" of type "text/plain" (247 bytes)
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