linux-kernel - [kernel/watchdog.c] ed235875e2c: -14.2% will-it-scale.scalability

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Message-ID: <53B6235B.4050205@intel.com>
Date:	Fri, 04 Jul 2014 11:45:31 +0800
From:	Jet Chen <jet.chen@...el.com>
To:	Aaron Tomlin <atomlin@...hat.com>
CC:	Fengguang Wu <fengguang.wu@...el.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	LKP <lkp@...org>
Subject: [kernel/watchdog.c] ed235875e2c: -14.2% will-it-scale.scalability

Hi Aaron,

FYI, we noticed the below changes on

commit ed235875e2ca983197831337a986f0517074e1a0 ("kernel/watchdog.c: print traces for all cpus on lockup detection")

test case: lkp-snb01/will-it-scale/signal1

f3aca3d09525f87  ed235875e2ca983197831337a
---------------  -------------------------
      0.12 ~ 0%     -14.2%       0.10 ~ 0%  TOTAL will-it-scale.scalability
    506146 ~ 0%      -4.4%     484004 ~ 0%  TOTAL will-it-scale.per_process_ops
     12193 ~ 4%     +12.6%      13726 ~ 6%  TOTAL slabinfo.kmalloc-256.active_objs
     12921 ~ 4%     +12.3%      14516 ~ 5%  TOTAL slabinfo.kmalloc-256.num_objs
    123094 ~ 3%      -6.5%     115117 ~ 3%  TOTAL meminfo.Committed_AS

Legend:
	~XX%    - stddev percent
	[+-]XX% - change percent


                            will-it-scale.per_process_ops

  515000 ++-----------------------------------------------------------------+
         |  .*.*.*.*.     .*                                                |
  510000 *+*         *.*.*  + .*.                               *.          |
  505000 ++                  *   *.*.*.*. .* .*.*.*. .*.*.*.   +  *.*.*.*.*.*
         |                               *  *       *       *.*             |
  500000 ++                                                                 |
         |                                                                  |
  495000 ++                                                                 |
         |                                                                  |
  490000 ++                                                                 |
  485000 ++            O O             O O  O O                             |
         |         O O     O O O O O O     O    O                           |
  480000 O+O O O O                                O                         |
         |                                                                  |
  475000 ++-----------------------------------------------------------------+


	[*] 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,
Jet


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