linux-kernel - [LKP] [timer] 17cdf560f27: +4.0% boot-meminfo.VmallocUsed

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Message-ID: <1427936769.6726.2.camel@intel.com>
Date:	Thu, 02 Apr 2015 09:06:09 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [timer] 17cdf560f27: +4.0% boot-meminfo.VmallocUsed

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git timer/alloc_tvec_statically
commit 17cdf560f2727f687ab159707d0aa591f8a2f82d ("timer: Allocate per-cpu tvec_base's statically")


testbox/testcase/testparams: lkp-sbx04/boot/performance-1

c5e77f5216abdd1d  17cdf560f2727f687ab159707d  
----------------  --------------------------  
         %stddev     %change         %stddev
             \          |                \  
    410996 ±  0%      +4.0%     427412 ±  0%  boot-meminfo.VmallocUsed

testbox/testcase/testparams: wsm/boot/performance-1

c5e77f5216abdd1d  17cdf560f2727f687ab159707d  
----------------  --------------------------  
     85712 ±  0%      +2.4%      87772 ±  0%  boot-meminfo.VmallocUsed

testbox/testcase/testparams: lkp-snb01/boot/performance-1

c5e77f5216abdd1d  17cdf560f2727f687ab159707d  
----------------  --------------------------  
    447001 ±  0%      -1.0%     442558 ±  0%  boot-slabinfo.num_objs
    125616 ±  5%     -13.5%     108720 ±  4%  boot-meminfo.DirectMap4k
    347196 ±  0%      +4.7%     363612 ±  0%  boot-meminfo.VmallocUsed

lkp-sbx04: Sandy Bridge-EX
Memory: 64G

wsm: Westmere
Memory: 6G

lkp-snb01: Sandy Bridge-EP
Memory: 32G




                              boot-meminfo.VmallocUsed

  90000 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
        *..*..*..*.*..*..*..*..*       *..*..*..*       *..*..*..*          |
  80000 ++                     :       :        :       :                   |
  70000 ++                     :       :        :       :                   |
        |                       :     :          :     :                    |
  60000 ++                      :     :          :     :                    |
  50000 ++                      :     :          :     :                    |
        |                       :     :          :     :                    |
  40000 ++                       :   :            :   :                     |
  30000 ++                       :   :            :   :                     |
        |                        :   :            :   :                     |
  20000 ++                       :   :            :   :                     |
  10000 ++                        : :              : :                      |
        |                         : :              : :                      |
      0 ++------------------------*-*--------------*-*----------------------+


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

To reproduce:

	apt-get install ruby
	git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
	cd lkp-tests
	bin/setup-local job.yaml # the job file attached in this email
	bin/run-local   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,
Ying Huang


View attachment "job.yaml" of type "text/plain" (1285 bytes)

View attachment "reproduce" of type "text/plain" (878 bytes)

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