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Date:   Sun, 10 Sep 2017 21:40:21 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     linux-kernel@...r.kernel.org, Joel Fernandes <joelaf@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josef Bacik <jbacik@...com>, Juri Lelli <Juri.Lelli@....com>,
        Brendan Jackman <brendan.jackman@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Rik van Riel <riel@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, lkp@...org
Subject: [lkp-robot] [sched/fair]  6d46bd3d97:  netperf.Throughput_tps -11.3%
 regression


Greeting,

FYI, we noticed a -11.3% regression of netperf.Throughput_tps due to commit:


commit: 6d46bd3d9705555382b83554b56a34f231d5d1dd ("sched/fair: Improve the behavior of sync flag")
url: https://github.com/0day-ci/linux/commits/Joel-Fernandes/sched-fair-Improve-the-behavior-of-sync-flag/20170829-191129


in testcase: netperf
on test machine: 8 threads Intel(R) Atom(TM) CPU C2750 @ 2.40GHz with 16G memory
with following parameters:

	ip: ipv4
	runtime: 300s
	nr_threads: 25%
	cluster: cs-localhost
	test: TCP_CRR
	cpufreq_governor: performance

test-description: Netperf is a benchmark that can be use to measure various aspect of networking performance.
test-url: http://www.netperf.org/netperf/

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: netperf/ipv4-300s-25%-cs-localhost-TCP_CRR-performance/lkp-avoton3

9c8783201cb58e9a  6d46bd3d9705555382b83554b5  
----------------  --------------------------  
      6829             -11%       6054        netperf.Throughput_tps
     68768 ±  7%     10484%    7278249        netperf.time.involuntary_context_switches
       165             -28%        119        netperf.time.percent_of_cpu_this_job_got
       497             -29%        354        netperf.time.system_time
   4106701            -100%      17497 ±  3%  netperf.time.voluntary_context_switches
      8921                        8696        vmstat.system.in
     62311             -21%      49214        vmstat.system.cs
     11.61               3%      12.00        boot-time.dhcp
     12.69               3%      13.08        boot-time.kernel_boot
       193               3%        198        boot-time.idle
     27.06                       27.81        boot-time.boot
     11950             399%      59639        perf-stat.cpu-migrations
      0.22              10%       0.25        perf-stat.ipc
      1.62                        1.58        perf-stat.iTLB-load-miss-rate%
      4.49              -9%       4.08        perf-stat.cpi
      1.19 ±  5%       -14%       1.03        perf-stat.cache-miss-rate%
 8.983e+10             -14%  7.732e+10        perf-stat.branch-instructions
 4.855e+11             -14%  4.166e+11        perf-stat.iTLB-loads
 4.857e+11             -15%  4.145e+11        perf-stat.instructions
 7.988e+09             -17%  6.669e+09        perf-stat.iTLB-load-misses
 7.348e+10             -20%  5.849e+10        perf-stat.cache-references
  19124461             -21%   15098659        perf-stat.context-switches
 2.181e+12             -23%   1.69e+12        perf-stat.cpu-cycles
     12.15             -25%       9.15        perf-stat.branch-miss-rate%
  8.72e+08 ±  5%       -31%  6.002e+08        perf-stat.cache-misses
 1.091e+10             -35%  7.072e+09        perf-stat.branch-misses




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-4.13.0-rc4-00163-g6d46bd3" of type "text/plain" (160935 bytes)

View attachment "job-script" of type "text/plain" (7249 bytes)

View attachment "job.yaml" of type "text/plain" (4781 bytes)

View attachment "reproduce" of type "text/plain" (374 bytes)

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