On Mon, Dec 23, 2013 at 01:19:04PM +0800, Alex Shi wrote: > On 12/22/2013 08:30 AM, fengguang...@intel.com wrote: > > Alex, > > > > We noticed some perf-stat.cpu-migrations changes by your commit > > Thanks for your wonder testing, Fengguang! > How many CPU in your system and how many dd task running?
For the case
kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
It's a KVM with 4 CPUs, 16G memory. There are 4 virtual disks, on top
of each disk there runs 10 dd tasks.
Thanks,
Fengguang
> >
> > 6eb8b571283e64e96ca1a91aad085f9e08f857f0 is the first bad commit
> > commit 6eb8b571283e64e96ca1a91aad085f9e08f857f0
> > Author: Alex Shi <alex....@linaro.org>
> > Date: Tue Nov 19 20:29:51 2013 +0800
> >
> > sched: remove rq->cpu_load[load_idx] array
> >
> > Since load_idx effect removed in load balance, we don't need the
> > load_idx decays in scheduler. that will save some process in sched_tick
> > and others places.
> >
> > Signed-off-by: Alex Shi <alex....@linaro.org>
> >
> >
> > Here are the changed stats comparing to its parent commit:
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 37779 ~40% +115.2% 81288 ~50%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 37779 +115.2% 81288 TOTAL
> > proc-vmstat.pgscan_direct_normal
> >
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd:
> > proc-vmstat.pgscan_direct_normal
> >
> > 160000
> > ++----------------------------------------------------------------+
> > |
> > |
> > 140000 ++
> > O
> > |
> > |
> > 120000 ++
> > |
> > | O
> > |
> > 100000 ++
> > |
> > |
> > |
> > 80000 ++ O
> > |
> > |
> > ..*
> > 60000 ++ ....
> > |
> > | ....
> > |
> > 40000 *+............... O ....
> > |
> > O *............... ........*.
> > |
> > 20000
> > ++-------------------------------*--------------------------------+
> >
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 121579 ~ 6% -50.8% 59852 ~13%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 121579 -50.8% 59852 TOTAL softirqs.SCHED
> >
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: softirqs.SCHED
> >
> > 140000
> > ++----------------------------------------------------------------+
> > 130000 ++ ....*........... ....*.......
> > |
> > | ........ .... ........ ......
> > |
> > 120000 *+... *....
> > ..|
> > 110000 ++
> > *
> > |
> > |
> > 100000 ++
> > |
> > 90000 ++
> > |
> > 80000 ++
> > |
> > |
> > |
> > 70000 ++ O O
> > |
> > 60000 ++ O
> > |
> > |
> > O
> > 50000 O+
> > |
> > 40000
> > ++----------------------------------------------------------------+
> >
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 5636 ~ 4% -22.1% 4392 ~17%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 5636 -22.1% 4392 TOTAL
> > proc-vmstat.nr_tlb_remote_flush
> >
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd:
> > proc-vmstat.nr_tlb_remote_flush
> >
> > 6500
> > ++------------------------------------------------------------------+
> > |
> > |
> > 6000 ++ ........*............
> > |
> > *........ ....
> > |
> > 5500 ++ O
> > *................*................|
> > |
> > *
> > 5000 ++ O
> > |
> > |
> > |
> > 4500 ++ O
> > |
> > |
> > |
> > 4000 ++
> > |
> > |
> > O
> > 3500 O+
> > |
> > |
> > |
> > 3000
> > ++------------------------------------------------------------------+
> >
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 5679 ~ 4% -21.9% 4437 ~17%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 5679 -21.9% 4437 TOTAL
> > proc-vmstat.nr_tlb_remote_flush_received
> >
> >
> >
> > 6500
> > ++------------------------------------------------------------------+
> > |
> > |
> > 6000 ++ ........*........
> > |
> > *........ ......
> > |
> > | ..
> > ........*................|
> > 5500 ++ O *........
> > *
> > |
> > |
> > 5000 ++ O
> > |
> > |
> > |
> > 4500 ++ O
> > |
> > |
> > |
> > |
> > |
> > 4000 ++
> > |
> > |
> > O
> > 3500
> > O+------------------------------------------------------------------+
> >
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 167 ~11% +19.4% 200 ~ 4%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 167 +19.4% 200 TOTAL uptime.idle
> >
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: uptime.idle
> >
> > 220
> > ++-------------------------------------------------------------------+
> > |
> > O
> > 210 ++
> > |
> > 200 O+ O
> > |
> > | ..*..... O
> > |
> > 190 ++ .... O ...
> > |
> > 180 ++ .... ....
> > |
> > | .... ....
> > |
> > 170 *+. .
> > .*
> > 160 ++ *...... ....
> > |
> > | .... ...
> > |
> > 150 ++ .... ...
> > |
> > 140 ++ .. ....
> > |
> > | *.
> > |
> > 130
> > ++-------------------------------------------------------------------+
> >
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 154781 ~ 5% -66.8% 51449 ~ 8%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 154781 -66.8% 51449 TOTAL perf-stat.cpu-migrations
> >
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd:
> > perf-stat.cpu-migrations
> >
> > 180000
> > ++----------------------------------------------------------------+
> > | ....*...........
> > |
> > 160000 ++ ........ ....
> > ........*...............|
> > *.... *........
> > *
> > 140000 ++
> > |
> > |
> > |
> > 120000 ++
> > |
> > |
> > |
> > 100000 ++
> > |
> > |
> > |
> > 80000 ++
> > |
> > |
> > |
> > 60000 ++ O
> > |
> > | O O
> > O
> > 40000
> > O+----------------------------------------------------------------+
> >
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 1943 ~ 3% -7.8% 1792 ~ 4%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 1943 -7.8% 1792 TOTAL vmstat.system.cs
> >
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd: vmstat.system.cs
> >
> > 2050
> > ++------------------------------------------------------------------+
> > | ........*................*.....
> > |
> > 2000 ++ .*........ ...
> > |
> > 1950 ++ .... ...
> > |
> > | ... ....
> > |
> > 1900 ++ ...
> > .|
> > 1850 ++.... O O
> > *
> > *.
> > |
> > 1800 ++ O
> > O
> > 1750 ++
> > |
> > |
> > |
> > 1700 ++
> > |
> > 1650 O+
> > |
> > |
> > |
> > 1600
> > ++------------------------------------------------------------------+
> >
> >
> > 1de157d718f6494 6eb8b571283e64e96ca1
> > --------------- -------------------------
> > 1216177 ~ 3% -9.4% 1101605 ~ 7%
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd
> > 1216177 -9.4% 1101605 TOTAL perf-stat.context-switches
> >
> > kbuildx/micro/dd-write/4HDD-JBOD-cfq-ext4-10dd:
> > perf-stat.context-switches
> >
> > 1.3e+06
> > ++--------------------------------------------------------------+
> > | ..*...............
> > |
> > 1.25e+06 ++ ...... *...............*.......
> > |
> > | ..... ......
> > |
> > 1.2e+06 *+. O
> > ..|
> > 1.15e+06 ++ O
> > *
> > | O
> > |
> > 1.1e+06 ++
> > |
> > |
> > O
> > 1.05e+06 ++
> > |
> > 1e+06 ++
> > |
> > |
> > |
> > 950000 O+
> > |
> > |
> > |
> > 900000
> > ++--------------------------------------------------------------+
> >
> >
>
>
> --
> Thanks
> Alex
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