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Date: Thu, 16 Jan 2014 10:18:11 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Alex Shi <alex.shi@...aro.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>, lkp@...ux.intel.com
Subject: Re: [sched] 73628fba4: +69% context switches
On Thu, Jan 16, 2014 at 10:02:06AM +0800, Alex Shi wrote:
> On 01/16/2014 09:23 AM, Fengguang Wu wrote:
> > On Mon, Jan 13, 2014 at 01:57:30PM +0800, Alex Shi wrote:
> >> On 01/11/2014 06:19 PM, Fengguang Wu wrote:
> >>> Alex,
> >>>
> >>> FYI, we find much increased interrupts and context switches introduced
> >>> by commit 73628fba4 ("sched: unify imbalance bias for target group")
> >>> in your noload branch:
> >>
> >> Many thanks for the generous and quick testing! :)
> >>
> >> few questions for the results and give a testing patch for try. it also push on github.
> >>
> >> What's about the aim7 shell_rtns_1 and shared throughput?
> >
> > The throughputs remain the same. We only report changed numbers.
>
> So many interrupt increase doesn't cause any performance change, that
> make more doubt of data correction.
> Could you like to give the typical vmstat output? Specially the
> sys/us/wa/id time percentages.
wfg@bee /lkp/result/lkp-ne04/micro/aim7/shell_rtns_1/x86_64-lkp/91dd08bd65052b483f96f75abcc93f2f1b67a62c/1% cat vmstat
1389799131.230965 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
1389799131.231067 r b swpd free buff cache si so bi bo in cs us sy id wa
1389799131.231088 1 0 0 11192512 0 850368 0 0 10 0 74 109 0 2 97 0
1389799132.202831 2 0 0 11088468 0 851636 0 0 0 0 651 4293 1 2 98 0
1389799133.203196 1 0 0 10954680 0 851672 0 0 0 0 277 2796 0 1 99 0
1389799134.203607 0 0 0 10954116 0 851692 0 0 0 0 193 493 0 0 100 0
1389799135.204022 0 0 0 10954964 0 851692 0 0 0 0 203 541 0 0 100 0
1389799136.204447 0 0 0 10955656 0 851756 0 0 0 0 210 513 0 0 100 0
1389799137.204838 0 0 0 10955564 0 851776 0 0 0 0 219 552 0 0 100 0
1389799138.205241 0 0 0 10956100 0 851776 0 0 0 0 204 529 0 0 100 0
1389799139.205667 0 0 0 10956400 0 851776 0 0 0 0 197 547 0 0 100 0
1389799140.206104 1 0 0 10956684 0 851844 0 0 0 0 222 539 0 0 100 0
1389799141.206506 0 0 0 10956412 0 851844 0 0 0 0 205 521 0 0 100 0
1389799142.206932 0 0 0 10956676 0 851892 0 0 0 0 213 532 0 0 100 0
1389799143.207206 1912 26 0 10354424 0 851960 0 0 0 0 8849 31376 28 67 6 0
1389799144.207531 1515 35 0 10318484 0 852092 0 0 0 0 7670 28332 31 69 0 0
1389799145.207852 1678 26 0 10303276 0 852196 0 0 0 0 7596 27208 31 69 0 0
1389799146.208176 1981 43 0 10264672 0 852284 0 0 0 0 7478 27313 31 69 0 0
1389799147.208500 1977 35 0 10299316 0 852380 0 0 0 0 8505 29552 30 70 0 0
1389799148.208820 1800 48 0 10300820 0 852500 0 0 0 0 8506 29456 31 69 0 0
1389799149.209144 1983 40 0 10310796 0 852600 0 0 0 0 8023 28719 29 71 0 0
1389799150.209466 1816 28 0 10267816 0 852676 0 0 0 0 7027 26286 32 68 0 0
1389799151.209784 1329 31 0 10193448 0 852780 0 0 0 0 8564 29613 30 70 0 0
1389799152.210105 1722 28 0 10193404 0 852896 0 0 0 0 8993 29358 30 70 0 0
1389799153.210427 1762 26 0 10338320 0 852976 0 0 0 0 9391 32241 30 71 0 0
1389799154.210751 1509 36 0 10203556 0 853100 0 0 0 0 10013 32206 30 70 0 0
1389799155.211073 1205 25 0 10229852 0 853212 0 0 0 0 9744 32089 30 70 0 0
1389799156.211398 1982 32 0 10329704 0 853288 0 0 0 0 8437 29161 29 71 0 0
1389799157.211718 1756 31 0 10250128 0 853384 0 0 0 0 7476 27144 30 70 0 0
1389799158.212032 1970 27 0 10358368 0 853496 0 0 0 0 7506 27875 30 70 0 0
1389799159.212365 1992 13 0 10306128 0 853604 0 0 0 0 8105 28380 31 69 0 0
1389799160.212681 1986 36 0 10243380 0 853692 0 0 0 0 8404 29428 30 70 0 0
1389799161.213004 1724 32 0 10265420 0 853760 0 0 0 0 7844 28716 29 71 0 0
1389799162.213337 1973 24 0 10364640 0 853876 0 0 0 0 7558 27253 31 69 0 0
1389799163.213660 1936 38 0 10236308 0 854008 0 0 0 0 7879 28209 31 69 0 0
1389799164.213988 1810 30 0 10265044 0 854076 0 0 0 0 9246 30739 31 69 0 0
1389799165.214307 1965 29 0 10344108 0 854184 0 0 0 0 9135 31255 30 70 0 0
1389799166.214628 1978 33 0 10344384 0 854300 0 0 0 0 8292 29067 29 71 0 0
1389799167.214938 1969 30 0 10289112 0 854400 0 0 0 0 6936 26226 29 71 0 0
1389799168.215253 958 12 0 10140312 0 854472 0 0 0 0 8210 29214 29 71 0 0
1389799169.215572 1408 35 0 10137160 0 854596 0 0 0 0 9562 31072 30 70 0 0
1389799170.215888 1218 13 0 10312800 0 854708 0 0 0 0 9135 31609 30 70 0 0
1389799171.217063 1232 20 0 10258360 0 854792 0 0 0 0 9021 30519 31 69 0 0
1389799172.217385 1988 25 0 10335908 0 854876 0 0 0 0 7756 27369 30 70 0 0
1389799173.217705 1688 16 0 10369428 0 855004 0 0 0 0 8611 30032 30 70 0 0
1389799174.218089 1981 27 0 10246728 0 855112 0 0 0 0 7634 26809 31 69 0 0
1389799175.218408 1829 45 0 10230396 0 855192 0 0 0 0 8219 29337 30 70 0 0
1389799176.218738 876 12 0 10146360 0 855268 0 0 0 0 8059 29358 31 69 0 0
1389799177.219060 1973 44 0 10284400 0 855412 0 0 0 0 9803 31449 29 71 0 0
1389799178.219380 1794 31 0 10173544 0 855492 0 0 0 0 15388 27535 31 69 0 0
1389799179.219704 1566 11 0 10245204 0 855584 0 0 0 0 10387 33849 30 70 0 0
1389799180.220096 1832 25 0 10329192 0 855692 0 0 0 0 8143 28547 31 69 0 0
1389799181.220418 1640 33 0 10088520 0 855804 0 0 0 0 7216 26359 31 69 0 0
1389799182.220738 1819 23 0 10222344 0 855884 0 0 0 0 8654 29991 31 69 0 0
1389799183.221059 1659 20 0 10271384 0 855976 0 0 0 0 8671 30317 30 70 0 0
1389799184.221379 1320 41 0 10110368 0 856108 0 0 0 0 7696 27189 28 72 0 0
1389799185.221692 1972 22 0 10356188 0 856200 0 0 0 0 8966 30778 30 70 0 0
1389799186.222098 1795 13 0 10237712 0 856284 0 0 0 0 8074 28370 31 69 0 0
1389799187.222344 1990 20 0 10407224 0 856372 0 0 0 0 8044 29019 31 69 0 0
1389799188.222960 1321 6 0 10124124 0 856504 0 0 0 0 7736 27526 30 70 0 0
1389799189.222988 1804 33 0 10300448 0 856604 0 0 0 0 8580 29567 30 70 0 0
1389799190.223321 1856 13 0 10313708 0 856676 0 0 0 0 8082 28645 31 69 0 0
1389799191.223652 1379 14 0 10114468 0 856800 0 0 0 0 8046 27986 30 70 0 0
1389799192.224033 1261 6 0 10161416 0 856908 0 0 0 0 9784 32060 30 70 0 0
1389799193.224349 1976 34 0 10328644 0 856988 0 0 0 0 8229 29247 32 68 0 0
1389799194.224668 1621 18 0 10257544 0 857088 0 0 0 0 7172 26597 31 69 0 0
1389799195.225020 1245 11 0 10208652 0 857208 0 0 0 0 7717 27843 31 69 0 0
1389799196.225342 1982 36 0 10255616 0 857304 0 0 0 0 9333 30885 31 69 0 0
1389799197.225669 1707 19 0 10245296 0 857384 0 0 0 0 7589 27529 31 69 0 0
1389799198.225999 1644 26 0 10182096 0 857468 0 0 0 0 8169 28721 31 69 0 0
1389799199.228106 1727 49 0 10031600 0 857604 0 0 0 0 7981 28096 30 70 0 0
1389799200.226631 1316 17 0 10179548 0 857696 0 0 0 0 9669 32554 31 69 0 0
1389799201.226977 1953 28 0 10296580 0 857780 0 0 0 0 9051 30902 32 68 0 0
1389799202.227297 1756 16 0 10376204 0 857876 0 0 0 0 8484 29803 30 70 0 0
1389799203.227616 1810 18 0 10308232 0 858004 0 0 0 0 7987 28169 31 69 0 0
1389799204.227940 1974 33 0 10271384 0 858096 0 0 0 0 8051 28489 31 69 0 0
1389799205.228265 1456 15 0 10377436 0 858176 0 0 0 0 8119 29356 30 70 0 0
1389799206.228586 1486 27 0 10507456 0 858300 0 0 0 0 7263 26390 31 69 0 0
1389799207.228910 636 10 0 10845116 0 858424 0 0 0 0 7603 27877 30 70 0 0
1389799208.229279 0 1 0 11144480 0 857444 0 0 0 0 12084 10976 11 24 61 4
1389799209.229695 0 0 0 11156876 0 857480 0 0 0 0 12877 879 0 0 88 12
wfg@bee /lkp/result/lkp-ne04/micro/aim7/shell_rtns_1/x86_64-lkp/v3.13-rc8/1% cat vmstat
1389532389.340878 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
1389532389.340981 r b swpd free buff cache si so bi bo in cs us sy id wa
1389532389.341018 1 0 0 11194112 0 850032 0 0 11 0 73 114 0 2 97 0
1389532390.311886 2 0 0 11086632 0 851316 0 0 0 0 602 4353 1 1 98 0
1389532391.312269 1 0 0 10957220 0 851640 0 0 0 0 250 2794 0 1 99 0
1389532392.312662 0 0 0 10956344 0 851648 0 0 0 0 201 488 0 0 100 0
1389532393.313071 0 0 0 10956192 0 851664 0 0 0 0 191 492 0 0 100 0
1389532394.313530 0 0 0 10955948 0 851728 0 0 0 0 200 535 0 0 100 0
1389532395.313928 0 0 0 10956636 0 851764 0 0 0 0 213 514 0 0 100 0
1389532396.314378 0 0 0 10957468 0 851784 0 0 0 0 202 523 0 0 100 0
1389532397.314827 0 0 0 10957268 0 851816 0 0 0 0 178 506 0 0 100 0
1389532398.315244 0 0 0 10957696 0 851816 0 0 0 0 225 538 0 0 100 0
1389532399.315693 0 0 0 10957864 0 851884 0 0 0 0 216 521 0 0 100 0
1389532400.316139 0 0 0 10957416 0 851884 0 0 0 0 218 520 0 0 100 0
1389532401.316410 1704 43 0 10258032 0 851904 0 0 0 0 4279 28293 27 67 6 0
1389532402.318320 1793 14 0 10430624 0 851980 0 0 0 0 4222 25462 30 70 0 0
1389532403.318634 1968 36 0 10305472 0 852116 0 0 0 0 4187 24538 30 70 0 0
1389532404.318940 1929 49 0 10354720 0 852220 0 0 0 0 4150 24892 29 71 0 0
1389532405.319257 1991 32 0 10321016 0 852288 0 0 0 0 4127 24437 30 70 0 0
1389532406.319576 1971 22 0 10329164 0 852412 0 0 0 0 4153 24855 29 71 0 0
1389532407.319885 1973 27 0 10349624 0 852504 0 0 0 0 4138 24729 31 69 0 0
1389532408.320208 1738 25 0 10196808 0 852604 0 0 0 0 4159 23941 30 70 0 0
1389532409.320586 1410 34 0 10313744 0 852676 0 0 0 0 4238 27216 31 69 0 0
1389532410.320896 1972 26 0 10373828 0 852808 0 0 0 0 4205 24042 31 69 0 0
1389532411.321213 1962 45 0 10281808 0 852908 0 0 0 0 4144 24928 30 70 0 0
1389532412.321551 1980 23 0 10385052 0 852980 0 0 0 0 4152 24672 31 69 0 0
1389532413.321872 1986 36 0 10271228 0 853068 0 0 0 0 4161 24411 31 69 0 0
1389532414.322188 1954 30 0 10379288 0 853196 0 0 0 0 4142 25049 29 71 0 0
1389532415.322493 1994 30 0 10297044 0 853284 0 0 0 0 4131 24370 31 69 0 0
1389532416.322804 1979 30 0 10351020 0 853392 0 0 0 0 4143 25007 29 71 0 0
1389532417.323118 1962 34 0 10325140 0 853476 0 0 0 0 4121 24227 31 69 0 0
1389532418.323419 1771 29 0 10242912 0 853568 0 0 0 0 4169 24515 32 69 0 0
1389532419.323736 1953 26 0 10363880 0 853696 0 0 0 0 4154 25473 29 71 0 0
1389532420.324054 1981 24 0 10300608 0 853772 0 0 0 0 4156 24419 30 70 0 0
1389532421.324365 1984 30 0 10329044 0 853872 0 0 0 0 4214 24887 30 70 0 0
1389532422.324680 1977 24 0 10339236 0 853968 0 0 0 0 4158 24516 31 69 0 0
1389532423.324999 1214 25 0 10195964 0 854104 0 0 0 0 4149 25003 30 70 0 0
1389532424.325315 1918 34 0 10385636 0 854164 0 0 0 0 4267 25195 31 69 0 0
1389532425.325632 1965 32 0 10287896 0 854248 0 0 0 0 4144 24609 30 70 0 0
1389532426.325987 1769 30 0 10334972 0 854356 0 0 0 0 4203 25440 31 69 0 0
1389532427.326300 1168 25 0 10273776 0 854480 0 0 0 0 4395 27553 30 70 0 0
1389532428.326615 1781 24 0 10333020 0 854556 0 0 0 0 4266 25006 31 69 0 0
1389532429.326934 1991 31 0 10320876 0 854652 0 0 0 0 4161 24652 29 71 0 0
1389532430.327248 1944 37 0 10295652 0 854760 0 0 0 0 4192 25078 29 71 0 0
1389532431.327558 1945 30 0 10376188 0 854868 0 0 0 0 4133 25084 31 70 0 0
1389532432.327874 1980 29 0 10314412 0 854952 0 0 0 0 4141 24534 30 70 0 0
1389532433.328178 1963 30 0 10352224 0 855044 0 0 0 0 4135 24935 31 69 0 0
1389532434.328500 1990 31 0 10331884 0 855160 0 0 0 0 4158 24668 30 70 0 0
1389532435.328815 1949 33 0 10348560 0 855260 0 0 0 0 4149 24665 30 70 0 0
1389532436.329125 1950 28 0 10332712 0 855344 0 0 0 0 4159 24642 31 69 0 0
1389532437.329437 1975 36 0 10349380 0 855424 0 0 0 0 4143 24827 30 70 0 0
1389532438.329758 1972 26 0 10314112 0 855544 0 0 0 0 4129 24529 30 70 0 0
1389532439.330075 1940 28 0 10353476 0 855664 0 0 0 0 4159 24677 30 70 0 0
1389532440.330379 1848 38 0 10313616 0 855752 0 0 0 0 4152 24955 31 69 0 0
1389532441.330678 1974 22 0 10347556 0 855816 0 0 0 0 4151 24473 29 71 0 0
1389532442.330991 1952 35 0 10314856 0 855932 0 0 0 0 4151 24735 30 70 0 0
1389532443.331298 1985 30 0 10337040 0 856060 0 0 0 0 4159 24705 29 71 0 0
1389532444.331615 1959 27 0 10315816 0 856140 0 0 0 0 4119 24603 31 69 0 0
1389532445.331917 1992 29 0 10341064 0 856220 0 0 0 0 4133 24982 30 70 0 0
1389532446.332235 1973 33 0 10314320 0 856356 0 0 0 0 4129 24519 30 70 0 0
1389532447.332548 1976 37 0 10342764 0 856428 0 0 0 0 4128 24765 30 70 0 0
1389532448.332859 1615 28 0 10229224 0 856524 0 0 0 0 4168 25250 30 70 0 0
1389532449.333163 1970 31 0 10293672 0 856644 0 0 0 0 4211 25534 30 70 0 0
1389532450.333472 1995 23 0 10368256 0 856764 0 0 0 0 4139 24344 31 69 0 0
1389532451.333796 1971 36 0 10277132 0 856824 0 0 0 0 4136 24742 30 70 0 0
1389532452.334111 1965 33 0 10371140 0 856932 0 0 0 0 4173 24934 30 70 0 0
1389532453.334424 1991 35 0 10284608 0 857036 0 0 0 0 4163 24709 30 70 0 0
1389532454.334733 1961 31 0 10365300 0 857156 0 0 0 0 4143 25047 30 70 0 0
1389532455.335048 1969 33 0 10316584 0 857236 0 0 0 0 4146 24730 31 69 0 0
1389532456.335362 1945 25 0 10334376 0 857360 0 0 0 0 4211 25016 31 69 0 0
1389532457.335681 1975 29 0 10327192 0 857472 0 0 0 0 4167 24583 30 70 0 0
1389532458.336000 1953 22 0 10327528 0 857548 0 0 0 0 4139 24951 30 70 0 0
1389532459.336310 1959 34 0 10329628 0 857616 0 0 0 0 4118 24270 31 69 0 0
1389532460.336620 1943 32 0 10332304 0 857756 0 0 0 0 4148 24753 30 70 0 0
1389532461.336936 1967 41 0 10331040 0 857848 0 0 0 0 4148 24814 31 69 0 0
1389532462.337255 1935 37 0 10287564 0 857932 0 0 0 0 4194 24927 32 68 0 0
1389532463.337585 1932 20 0 10376600 0 858004 0 0 0 0 4131 24999 30 70 0 0
1389532464.338305 1602 31 0 10461852 0 858156 0 0 0 0 4144 24206 30 70 0 0
1389532465.338265 682 14 0 10835680 0 858252 0 0 0 0 4201 24627 30 70 0 0
1389532466.338738 0 0 0 11160304 0 857256 0 0 0 0 2404 11651 12 25 62 0
> BTW
> Just confirm, the benchmark is running on a native machine, not a kvm
> guest, right?
Yes. It's lkp-ne04.
Thanks,
Fengguang
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