linux-kernel - [lkp] [f2fs] 3bdad3c7ee: aim7.jobs-per-min -25.3% regression

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Date:	Thu, 14 Jul 2016 10:55:10 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Jaegeuk Kim <jaegeuk@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp] [f2fs]  3bdad3c7ee: aim7.jobs-per-min -25.3% regression


FYI, we noticed a -25.3% regression of aim7.jobs-per-min due to commit:

commit 3bdad3c7ee72a76ec87be3477eb958ed7ca304fc ("f2fs: skip to check the block address of node page")
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

in testcase: aim7
on test machine: 48 threads Ivytown Ivy Bridge-EP with 64G memory
with following parameters: disk=1BRD_48G/fs=f2fs/load=3000/test=disk_cp


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.

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


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

=========================================================================================
compiler/disk/fs/kconfig/load/rootfs/tbox_group/test/testcase:
  gcc-4.9/1BRD_48G/f2fs/x86_64-rhel/3000/debian-x86_64-2015-02-07.cgz/ivb44/disk_cp/aim7

commit: 
  2555a2d558 ("f2fs: shrink critical region in spin_lock")
  3bdad3c7ee ("f2fs: skip to check the block address of node page")

2555a2d55822c9b2 3bdad3c7ee72a76ec87be3477e 
---------------- -------------------------- 
         %stddev     %change         %stddev
             \          |                \  
    163989 ±  1%     -25.3%     122533 ±  3%  aim7.jobs-per-min
    110.02 ±  1%     +33.9%     147.30 ±  3%  aim7.time.elapsed_time
    110.02 ±  1%     +33.9%     147.30 ±  3%  aim7.time.elapsed_time.max
    140571 ±  1%    +166.6%     374804 ±  5%  aim7.time.involuntary_context_switches
    153474 ±  1%    +172.8%     418682 ±  1%  aim7.time.minor_page_faults
      1683 ±  2%    +214.5%       5292 ±  4%  aim7.time.system_time
  15776849 ±  1%     -95.8%     670202 ±  3%  aim7.time.voluntary_context_switches



Thanks,
Xiaolong

View attachment "config-4.7.0-rc1-00170-g3bdad3c" of type "text/plain" (150952 bytes)

View attachment "job.yaml" of type "text/plain" (3089 bytes)

View attachment "reproduce" of type "text/plain" (97 bytes)