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Subject[LKP] [sched/fair] 638476007d1: +1.1% unixbench.score
From
Date
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


---
testcase: unixbench
default-monitors:
wait: pre-test
uptime:
iostat:
vmstat:
numa-numastat:
numa-vmstat:
numa-meminfo:
proc-vmstat:
proc-stat:
meminfo:
slabinfo:
interrupts:
lock_stat:
latency_stats:
softirqs:
bdi_dev_mapping:
diskstats:
nfsstat:
cpuidle:
cpufreq-stats:
turbostat:
pmeter:
sched_debug:
interval: 10
default_watchdogs:
watch-oom:
watchdog:
cpufreq_governor:
commit: f876f0cff6d460f03cd937104314f366dfa92261
model: Nehalem
memory: 6G
hdd_partitions: "/dev/disk/by-id/ata-Hitachi_HDT721050SLA360_STH3D7ME0YEM5Y-part5
/dev/disk/by-id/ata-Hitachi_HDT721050SLA360_STH3D7ME0YEM5Y-part6 /dev/disk/by-id/ata-Hitachi_HDT721050SLA360_STH3D7ME0YEM5Y-part7
/dev/disk/by-id/ata-Hitachi_HDT721050SLA360_STH3D7ME0YEM5Y-part8"
swap_partitions:
rootfs_partition: "/dev/disk/by-id/ata-Hitachi_HDT721050SLA360_STH3D7ME0YEM5Y-part2"
netconsole_port: 6647
unixbench:
test: spawn
testbox: nhm-white
tbox_group: nhm-white
kconfig: x86_64-rhel
enqueue_time: 2015-02-07 10:33:58.062824131 +08:00
head_commit: f876f0cff6d460f03cd937104314f366dfa92261
base_commit: e36f014edff70fc02b3d3d79cead1d58f289332e
branch: linux-devel/devel-hourly-2015020522
kernel: "/kernel/x86_64-rhel/f876f0cff6d460f03cd937104314f366dfa92261/vmlinuz-3.19.0-rc7-gf876f0c"
user: lkp
queue: cyclic
rootfs: debian-x86_64-2015-02-07.cgz
result_root: "/result/nhm-white/unixbench/spawn/debian-x86_64-2015-02-07.cgz/x86_64-rhel/f876f0cff6d460f03cd937104314f366dfa92261/0"
job_file: "/lkp/scheduled/nhm-white/cyclic_unixbench-spawn-x86_64-rhel-HEAD-f876f0cff6d460f03cd937104314f366dfa92261-0-20150207-2034-iuwy40.yaml"
dequeue_time: 2015-02-07 17:02:49.045648302 +08:00
nr_cpu: "$(nproc)"
job_state: finished
loadavg: 4.52 1.97 0.74 1/151 24204
start_time: '1423299793'
end_time: '1423299991'
version: "/lkp/lkp/.src-20150207-030212"
./Run spawn
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