linux-kernel - [rcu] 0eb885afb20: -25.8% softirqs.RCU

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Date:	Thu, 21 Aug 2014 21:50:35 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [rcu] 0eb885afb20: -25.8% softirqs.RCU

Hi Pranith,

FYI, these changes look nice:

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
commit 0eb885afb20317016670c1c5dd3a436c91e1e910 ("rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads")

test case: lkp-a04/aim7/400-disk_rr

It's an in-memory aim7/disk_rr test.
lkp-a04 is an Atom micro server with 8G Memory.

5db6a289a3a0a69  0eb885afb20317016670c1c5d 
---------------  ------------------------- 
    150860 ± 1%     -25.8%     111937 ± 1%  TOTAL softirqs.RCU
      2809 ± 1%     -12.5%       2457 ± 1%  TOTAL vmstat.system.cs
      4202 ± 1%      -6.9%       3911 ± 1%  TOTAL vmstat.system.in
    212421 ± 2%      -7.7%     196035 ± 3%  TOTAL time.involuntary_context_switches

                                 vmstat.system.in

  4300 ++-------------------------------------------------------------------+
       | .*..                  *..        .*..                     *        |
  4250 *+            .*..     +        .*.    *              *.. .. :       |
  4200 ++    *..*..*.    *.. +    *..*.        :           ..   *    :      |
       |                    *                   :        .*          :  .*  |
  4150 ++                                       :  .*..*.             *.    |
  4100 ++                                        *.                         |
       |                                                                    |
  4050 ++                                                                   |
  4000 ++                                                                   |
       |  O  O              O              O                             O  |
  3950 O+       O  O     O     O     O  O        O     O  O     O           |
  3900 ++             O                       O     O              O        |
       |                                                     O              |
  3850 ++-------------------------O-----------------------------------O-----O


                                 vmstat.system.cs

  3000 ++-------------------------------------------------------------------+
       |                                                                    |
  2900 ++                      *..                                          |
       *..*..*..*..*..*..*.. ..   *..*..*..*..*..           .*..  .*..      |
  2800 ++                   *                            .*.    *.      .*  |
       |                                         *..*..*.             *.    |
  2700 ++                                                                   |
       |                                                                    |
  2600 ++                                                                   |
       |              O                 O                                   |
  2500 O+ O  O     O        O  O     O     O              O     O  O     O  |
       |        O        O        O              O     O                    |
  2400 ++                                     O     O                 O     O
       |                                                     O              |
  2300 ++-------------------------------------------------------------------+


	[*] 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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