linux-kernel - [ext4] 71d4f7d0321: -49.6% xfstests.generic.274.seconds

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Date:	Thu, 21 Aug 2014 22:30:06 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	ext4@...alhost, LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [ext4] 71d4f7d0321: -49.6% xfstests.generic.274.seconds

Hi Ted,

We noticed increased xfstests 274's test speed and the first good
commit is 71d4f7d032149b935a26eb3ff85c6c837f3714e1 ("ext4: remove
metadata reservation checks").

test case: snb-drag/xfstests/4HDD-ext4-generic-slow2
snb-drag is a Sandy Bridge PC with 6G memory.

d5e03cbb0c88cd1  71d4f7d032149b935a26eb3ff 
---------------  ------------------------- 
        51 ± 2%     -49.6%         25 ± 1%  TOTAL xfstests.generic.274.seconds
       817 ± 1%      -3.0%        792 ± 1%  TOTAL time.elapsed_time

                          xfstests.generic.274.seconds

  60 ++---------------------------------------------------------------------+
     |                                                                      |
  55 ++         .*..*..             *..               *..                   |
     |       .*.       .          ..                ..                      |
  50 *+.*..*.           *..*..*..*     *..*..*..*..*     *                  |
     |                                                                      |
  45 ++                                                                     |
     |                                                                      |
  40 ++                                                                     |
     |                                                                      |
  35 ++                                                                     |
     |                                                                      |
  30 ++                                                                     |
     |                                                                      |
  25 O+-O--O--O--O--O---O--O--O--O--O--O--O--O--O--O--O--O---O--O--O--O--O--O


	[*] 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,
Fengguang

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