linux-kernel - [LKP] [x86] f5b2831d65: +93.3% boot-meminfo.DirectMap4k

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Date:	Mon, 12 Jan 2015 11:18:37 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Juergen Gross <jgross@...e.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [x86] f5b2831d65: +93.3% boot-meminfo.DirectMap4k

FYI, we noticed the below changes on

commit f5b2831d654167d77da8afbef4d2584897b12d0c ("x86: Respect PAT bit when copying pte values between large and normal pages")

This may be the expected behavior.

testbox/testcase/testparams: lkp-nex04/boot/performance-1

f439c429c3209819  f5b2831d654167d77da8afbef4  
----------------  --------------------------  
         %stddev     %change         %stddev
             \          |                \  
      6584 ±  0%     +93.3%      12728 ±  0%  boot-meminfo.DirectMap4k
     41.19 ±  1%      +2.1%      42.05 ±  0%  boottime.dhcp


                              boot-meminfo.DirectMap4k

  13000 ++------------------------------------------------------------------+
        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 O    |
  12000 ++                                                                  |
        |                                                                   |
  11000 ++                                                                  |
        |                                                                   |
  10000 ++                                                                  |
        |                                                                   |
   9000 ++                                                                  |
        |                                                                   |
   8000 ++                                                                  |
        |                                                                   |
   7000 *+*..*.                                                             |
        |      *..*.*..*.*.*..*.*..*.*..*.*.*..*.*..*.*..*.*.*..*.*..*.*..*.*
   6000 ++------------------------------------------------------------------+


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

Best Regards,
Huang, Ying



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