linux-kernel - [lkp] [xfs] ad68972acb: xfstests.time.file_system

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Date:	Thu, 7 Apr 2016 09:12:45 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Dave Chinner <dchinner@...hat.com>
Cc:	Dave Chinner <david@...morbit.com>, Christoph Hellwig <hch@....de>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [xfs] ad68972acb: xfstests.time.file_system_outputs -6.0%
 improvement

FYI, we noticed that xfstests.time.file_system_outputs -6.0% improvement on

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit ad68972acb82c3e8bba316d542ab204984cb1f1c ("xfs: xfs_cluster_write is redundant")


=========================================================================================
compiler/disk/fs/kconfig/rootfs/tbox_group/test/testcase:
  gcc-4.9/4HDD/xfs/x86_64-rhel/debian-x86_64-2015-02-07.cgz/vm-kbuild-4G/generic-127/xfstests

commit: 
  fbcc025613590d7b1d15521555dcc6393a148a6b
  ad68972acb82c3e8bba316d542ab204984cb1f1c

fbcc025613590d7b ad68972acb82c3e8bba316d542 
---------------- -------------------------- 
         %stddev     %change         %stddev
             \          |                \  
   8055643 ±  0%      -6.0%    7568459 ±  0%  xfstests.time.file_system_outputs
     11.74 ±  2%     +28.9%      15.13 ± 21%  xfstests.time.user_time
     11.74 ±  2%     +28.9%      15.13 ± 21%  time.user_time


vm-kbuild-4G: qemu-system-x86_64 -enable-kvm -cpu qemu64,+ssse3
Memory: 4G



                          xfstests.time.file_system_outputs

  9e+06 ++------------------------------------------------------------------+
        *.*.*.*.*.*.*.*.*.*.*.*   *.*.*.*.*.*.*.*.*.*.*.*.*   *.*.*.*.*.*.*.*
  8e+06 O+O         O O O O O O O O O O O O O O O O O O O O O :             |
  7e+06 ++                    :   :                       :   :             |
        |                     :   :                       :   :             |
  6e+06 ++                     : :                         : :              |
  5e+06 ++                     : :                         : :              |
        |                      : :                         : :              |
  4e+06 ++                     : :                         : :              |
  3e+06 ++                     : :                         : :              |
        |                      : :                         : :              |
  2e+06 ++                      :                           :               |
  1e+06 ++                      :                           :               |
        |                       :                           :               |
      0 ++--O-O-O-O-------------*---------------------------*---------------+



	[*] bisect-good sample
	[O] bisect-bad  sample

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


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 Ye

View attachment "job.yaml" of type "text/plain" (3102 bytes)

View attachment "reproduce" of type "text/plain" (806 bytes)