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Date: Mon, 09 Feb 2015 11:27:35 +0800
From: Huang Ying <ying.huang@...el.com>
To: Xunlei Pang <pang.xunlei@...aro.org>
Cc: Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [sched/fair] 638476007d1: +1.1% unixbench.score
FYI, we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
commit 638476007d13534b2ed4134bf0279ef44071140b ("sched/fair: Fix the dealing with decay_count in __synchronize_entity_decay()")
It appears that your patch cause CPU usage increased a little, so that unixbench score increased.
testbox/testcase/testparams: nhm-white/unixbench/spawn
7f1a169b88f513e3 638476007d13534b2ed4134bf0
---------------- --------------------------
%stddev %change %stddev
\ | \
268908 ± 0% +4.6% 281320 ± 0% unixbench.time.involuntary_context_switches
1.147e+08 ± 0% +1.5% 1.164e+08 ± 0% unixbench.time.minor_page_faults
3607 ± 0% +1.1% 3648 ± 0% unixbench.score
324 ± 0% +1.2% 328 ± 0% unixbench.time.percent_of_cpu_this_job_got
633 ± 0% +1.2% 641 ± 0% unixbench.time.system_time
54100 ± 3% +51.0% 81705 ± 21% sched_debug.cpu#4.ttwu_local
65678 ± 7% +49.5% 98187 ± 16% sched_debug.cpu#6.ttwu_local
5624 ± 31% +52.1% 8553 ± 11% sched_debug.cpu#6.curr->pid
58 ± 20% +37.6% 80 ± 7% sched_debug.cfs_rq[3]:/.runnable_load_avg
61 ± 10% +22.5% 74 ± 14% sched_debug.cpu#2.cpu_load[3]
218479 ± 5% +15.4% 252190 ± 5% sched_debug.cpu#6.ttwu_count
102 ± 17% -19.3% 82 ± 10% sched_debug.cpu#4.cpu_load[2]
423974 ± 4% +15.6% 490072 ± 5% sched_debug.cpu#5.avg_idle
62 ± 4% +16.9% 72 ± 9% sched_debug.cpu#2.cpu_load[4]
152298 ± 2% +9.7% 167037 ± 3% sched_debug.cfs_rq[5]:/.min_vruntime
156795 ± 1% +11.3% 174544 ± 1% sched_debug.cfs_rq[7]:/.min_vruntime
155535 ± 3% +11.8% 173813 ± 2% sched_debug.cfs_rq[6]:/.min_vruntime
9231 ± 0% +1.3% 9348 ± 0% vmstat.system.in
nhm-white: Nehalem
Memory: 6G
unixbench.time.system_time
643 ++---------------------------------------------------------------O----+
642 ++ 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 |
641 ++ O O O O |
640 ++ |
| |
639 ++ |
638 ++ |
637 ++ |
| |
636 ++ |
635 ++ .* |
*.*.. .*..* + .*.. .*.*.. * |
634 ++ * *..*.*..* * + |
633 ++--------------------------------*-----------------------------------+
unixbench.time.involuntary_context_switches
286000 ++-----------------------------------------------------------------+
284000 ++ O |
| O O |
282000 ++ O O O
280000 O+O O O O O O O O O O O O |
| O O O O O O O O |
278000 ++ O O O |
276000 ++ |
274000 ++ |
| |
272000 ++ |
270000 ++ .*.*. *.*.. .* |
*.*. *..*. .* : *.*.*. |
268000 ++ * + : |
266000 ++----------------*--*---------------------------------------------+
kmsg.tsc:Fast_TSC_calibration_failed
1 ++-------------------------------------O--------O---------------------+
| |
| |
0.8 ++ |
| |
| |
0.6 ++ |
| |
0.4 ++ |
| |
| |
0.2 ++ |
| |
| |
0 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-O
[*] bisect-good sample
[O] bisect-bad sample
To reproduce:
apt-get install ruby ruby-oj
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,
Huang, Ying
View attachment "job.yaml" of type "text/plain" (1882 bytes)
View attachment "reproduce" of type "text/plain" (12 bytes)
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