linux-kernel - [lkp-robot] [EXPERIMENTAL] d1de9d10db: will-it-scale.per_process

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Date:   Thu, 14 Sep 2017 12:27:45 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, lkp@...org
Subject: [lkp-robot] [EXPERIMENTAL]  d1de9d10db:
 will-it-scale.per_process_ops -2.4% regression


Greeting,

FYI, we noticed a -2.4% regression of will-it-scale.per_process_ops due to commit:


commit: d1de9d10dbdac46e9f45325252464eaf2a386388 ("EXPERIMENTAL: Diagnostics for lost timer events")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git rcu/dev

in testcase: will-it-scale
on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 4 -m 5G
with following parameters:

	test: lseek2

test-description: 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.
test-url: https://github.com/antonblanchard/will-it-scale



Details are as below:
-------------------------------------------------------------------------------------------------->


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email

testcase/path_params/tbox_group/run: will-it-scale/lseek2/vm-lkp-a03

eb14701b75404199  d1de9d10dbdac46e9f45325252  
----------------  --------------------------  
     12930 ±  5%       741%     108810        will-it-scale.time.involuntary_context_switches
       224                         222        will-it-scale.time.system_time
       124                         122        will-it-scale.time.percent_of_cpu_this_job_got
   2808016                     2741901        will-it-scale.per_process_ops
     62.29                       60.73        will-it-scale.time.user_time
   1839998              -4%    1769496        will-it-scale.per_thread_ops
      1654 ±  7%       169%       4457 ±  3%  vmstat.system.cs
      3008              33%       4013 ±  4%  vmstat.system.in
     81.23               5%      85.58        boot-time.boot
       217               5%        228        boot-time.idle
     16.34               4%      16.93        boot-time.dhcp
     16.43               4%      17.01        boot-time.kernel_boot
      7057 ± 39%      2e+05     215369 ±165%  latency_stats.avg.max


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-rc2-00080-gd1de9d1" of type "text/plain" (160956 bytes)

View attachment "job-script" of type "text/plain" (6590 bytes)