linux-kernel - [mm/page] 6d9e8c651d: phoronix-test-suite.iozone.1MB.2GB.WritePerformance.mb

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Message-ID: <20200407075703.GY8179@shao2-debian>
Date:   Tue, 7 Apr 2020 15:57:03 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Wen Yang <wenyang@...ux.alibaba.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Qian Cai <cai@....pw>, Tejun Heo <tj@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: [mm/page] 6d9e8c651d:
 phoronix-test-suite.iozone.1MB.2GB.WritePerformance.mb_s 2.2% improvement

Greeting,

FYI, we noticed a 2.2% improvement of phoronix-test-suite.iozone.1MB.2GB.WritePerformance.mb_s due to commit:


commit: 6d9e8c651dd979aa666bee15f086745f3ea9c4b3 ("mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio()")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: phoronix-test-suite
on test machine: 16 threads Intel(R) Xeon(R) CPU X5570 @ 2.93GHz with 48G memory
with following parameters:

	test: iozone-1.9.5
	cpufreq_governor: performance
	ucode: 0x1d

test-description: The Phoronix Test Suite is the most comprehensive testing and benchmarking platform available that provides an extensible framework for which new tests can be easily added.
test-url: http://www.phoronix-test-suite.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 run     job.yaml

=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase/ucode:
  gcc-7/performance/x86_64-rhel-7.6/debian-x86_64-phoronix/lkp-nhm-2ep1/iozone-1.9.5/phoronix-test-suite/0x1d

commit: 
  8e57f8acbb ("mm, debug_pagealloc: don't rely on static keys too early")
  6d9e8c651d ("mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio()")

8e57f8acbbd121ec 6d9e8c651dd979aa666bee15f08 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
      3312            +2.2%       3386        phoronix-test-suite.iozone.1MB.2GB.WritePerformance.mb_s
     18.12 ± 53%     -40.6%      10.76        phoronix-test-suite.time.system_time


                                                                                
             phoronix-test-suite.iozone.1MB.2GB.WritePerformance.mb_s           
                                                                                
  3500 +--------------------------------------------------------------------+   
       |          O O O O                         O                         |   
  3400 |-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 |   
  3300 |-+                  .+.   .+. .+.. .+. .+. .+.  .+. .+.+.+.+        |   
       |                  +.   +.+   +    +   +   +   +.   +                |   
  3200 |-+               +                                                  |   
       |.             +.+                                                   |   
  3100 |-+.          +                                                      |   
       |   +     .+.+                                                       |   
  3000 |-+ :    +                                                           |   
  2900 |-+  :  :                                                            |   
       |    :  :                                                            |   
  2800 |-+  : :                                                             |   
       |     ::                                                             |   
  2700 +--------------------------------------------------------------------+   
                                                                                
                                                                                
[*] 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,
Rong Chen


View attachment "config-5.5.0-rc6-00007-g6d9e8c651dd979" of type "text/plain" (202256 bytes)

View attachment "job-script" of type "text/plain" (7146 bytes)

View attachment "job.yaml" of type "text/plain" (4748 bytes)

View attachment "reproduce" of type "text/plain" (298 bytes)