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Date: Wed, 11 Oct 2017 09:32:42 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
"H. Peter Anvin" <hpa@...or.com>, tipbuild@...or.com, lkp@...org
Subject: [lkp-robot] [sched/fair] c7b5021681: hackbench.throughput -9.0%
regression
Greeting,
FYI, we noticed a -9.0% regression of hackbench.throughput due to commit:
commit: c7b50216818ef3dca14a52e3499750fbad2d9691 ("sched/fair: Remove se->load.weight from se->avg.load_sum")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git sched/core
in testcase: hackbench
on test machine: 8 threads Intel(R) Atom(TM) CPU C2750 @ 2.40GHz with 16G memory
with following parameters:
nr_threads: 1600%
mode: process
ipc: socket
cpufreq_governor: performance
test-description: Hackbench is both a benchmark and a stress test for the Linux kernel scheduler.
test-url: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/sched/cfs-scheduler/hackbench.c
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 run job.yaml
testcase/path_params/tbox_group/run: hackbench/1600%-process-socket-performance/lkp-avoton3
3d4b60d3e3dde6ea c7b50216818ef3dca14a52e349
---------------- --------------------------
22302 -9% 20297 hackbench.throughput
45912536 40% 64214329 hackbench.time.voluntary_context_switches
2743841 ± 3% -11% 2442816 hackbench.time.minor_page_faults
5009676 213% 15682381 ± 3% hackbench.time.involuntary_context_switches
26970 103% 54756 vmstat.system.in
82806 59% 131735 vmstat.system.cs
12.50 4% 13.02 boot-time.dhcp
1491351 10% 1645037 perf-stat.cpu-migrations
1.20 55% 1.86 perf-stat.branch-miss-rate%
1.229e+10 ± 3% 43% 1.758e+10 perf-stat.branch-misses
5.659e+10 ± 3% -7% 5.263e+10 perf-stat.cache-misses
28.81 -9% 26.08 perf-stat.cache-miss-rate%
2.19 7% 2.34 perf-stat.cpi
0.21 32% 0.28 perf-stat.iTLB-load-miss-rate%
51611348 56% 80586388 perf-stat.context-switches
1.211e+10 22% 1.474e+10 perf-stat.iTLB-load-misses
1.025e+12 ± 3% -8% 9.468e+11 perf-stat.branch-instructions
5.746e+12 ± 3% -8% 5.293e+12 perf-stat.instructions
5.744e+12 ± 3% -8% 5.293e+12 perf-stat.iTLB-loads
474 -24% 359 perf-stat.instructions-per-iTLB-miss
0.46 -6% 0.43 perf-stat.ipc
2874382 ± 3% -10% 2572671 perf-stat.minor-faults
2874383 ± 3% -10% 2572671 perf-stat.page-faults
hackbench.time.involuntary_context_switches
3e+07 +-+---------------------------------------------------------------+
| O O O |
2.5e+07 +-+OO O O O OOO O O O OO OO O |
OO O O |
| |
2e+07 +-+ |
| O |
1.5e+07 +-+ O O OOO |
| |
1e+07 +-+ |
| |
| .+ .+ +. .+ + + + .+ .+ |
5e+06 +-+++ ++.++ + ++.+++.++.+++ +.++.+ +.++.+ +.++.+ + + ++.++.+|
| |
0 +-+---------------------------------------------------------------+
perf-stat.ipc
0.465 +-+-----------------------------------------------------------------+
0.46 +-++ ++.+ .+++.+ +.+ ++.+ .++. ++ +.++. +.+ |
| + +.+ .+ ++ + + + : .++. |
0.455 +-+ + :+ + +.++ +|
0.45 +-+ + +.+ |
| |
0.445 +-+ |
0.44 +-+ |
0.435 +-+ |
| |
0.43 +-+ O OO |
0.425 +-+ O OO O O O OO OO O |
| O O OO OO O O O |
0.42 OO+ O O O O |
0.415 +-+-----------------------------------------------------------------+
perf-stat.cpi
2.4 O-+---------O--------------------------------------------------------+
|O O OO O O |
| OO O O O O OO O |
2.35 +-+ O O O O O O O O O |
| O O O |
| |
2.3 +-+ |
| |
2.25 +-+ |
| |
| + +. |
2.2 +-+ .+ :+ + ++.+ .+|
| +. .++ + ++. .+ +. +. + +.++ |
|+.+ .++.+ ++.++ ++. +.++ +.+ ++. ++.+ ++ |
2.15 +-+------------------------------------------------------------------+
[*] 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-4.14.0-rc2-00178-gc7b5021" of type "text/plain" (163211 bytes)
View attachment "job-script" of type "text/plain" (6883 bytes)
View attachment "job.yaml" of type "text/plain" (4455 bytes)
View attachment "reproduce" of type "text/plain" (995 bytes)
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