Comment 328 for bug 620074

Kernel 2.6.30-rc2
Other info see comment #304

TEST 1
----------------------------------------------------------------------------
yura@suse:~> dd if=/dev/zero of=./bigfile bs=1M count=15000 & ./fsync-tester
[1] 4561
fsync time: 0.0401
fsync time: 2.4475
fsync time: 1.7808
fsync time: 1.1141
fsync time: 1.6912
fsync time: 1.0753
fsync time: 1.2931
fsync time: 0.3260
fsync time: 0.3653
fsync time: 0.5603
.....
fsync time: 1.3651
fsync time: 1.0479
fsync time: 1.0806
fsync time: 0.6021
fsync time: 0.4708
fsync time: 1.3952
fsync time: 0.6665
fsync time: 1.4431
fsync time: 1.0893
fsync time: 1.7844
fsync time: 0.6520
fsync time: 0.3665
fsync time: 0.8171
fsync time: 0.7537
fsync time: 1.2100
fsync time: 0.9319
fsync time: 1.1578
fsync time: 1.1377
fsync time: 1.4913
fsync time: 1.0317
fsync time: 0.5870
fsync time: 1.8464
fsync time: 1.4770
fsync time: 1.3934
fsync time: 1.3794
fsync time: 0.7868
15000+0 записей считано
15000+0 записей написано
 скопировано 15728640000 байт (16 GB), 172,839 c, 91,0 MB/c
^C

procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r b swpd free buff cache si so bi bo in cs us sy id wa
 0 4 0 6189644 808 1572324 0 0 4 116748 1585 1548 2 26 6 67
 1 3 0 6098828 808 1663460 0 0 0 84472 973 1538 2 7 0 91
 0 4 0 6011692 808 1749652 0 0 0 88416 722 1248 2 6 0 92
 0 3 0 5915592 808 1844204 0 0 0 95232 996 1668 1 7 0 92
 1 4 0 5834692 808 1925564 0 0 0 77832 672 838 1 6 0 93
 0 4 0 5755452 808 2005900 0 0 0 79872 940 1472 1 5 0 93
 1 2 0 5664856 808 2096760 0 0 0 88744 746 1316 1 6 0 92
 0 4 0 5574556 808 2185520 0 0 0 86368 802 1286 1 6 0 93
 0 3 0 5492072 808 2268036 0 0 0 81408 785 1112 1 6 0 93
 0 4 0 5412744 808 2347624 0 0 0 78344 926 1400 1 5 0 93
 0 3 0 5333768 808 2428624 0 0 0 78848 659 1046 1 5 50 43
 0 4 0 5245744 808 2516336 0 0 0 86536 992 1526 1 6 50 42
 0 4 0 5153952 808 2605988 0 0 0 89088 947 4596 4 7 48 41
 0 3 0 5074720 808 2686532 0 0 0 78336 958 1768 1 6 49 43
 0 4 0 4974280 808 2787192 0 0 0 92198 706 1028 1 7 20 72
 0 3 0 4897224 808 2862716 0 0 0 80905 1046 1650 1 5 49 45
 0 4 0 4819832 808 2940944 0 0 0 77348 1193 2076 1 6 0 93
 1 2 0 4730172 808 3031732 0 0 0 82104 733 1020 1 6 1 91
 0 3 0 4648668 808 3112676 0 0 0 86864 994 1674 1 6 50 42
 1 3 0 4556864 808 3203828 0 0 0 87232 708 1136 2 6 49 43

TEST 2
----------------------------------------------------------------------------
yura@suse:~> dd if=/dev/zero of=./bigfile2 bs=1M count=15000
15000+0 записей считано
15000+0 записей написано
 скопировано 15728640000 байт (16 GB), 174,036 c, 90,4 MB/c

procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r b swpd free buff cache si so bi bo in cs us sy id wa
 1 3 0 45296 0 7683084 0 0 0 79360 1196 2213 1 6 33 60
 0 3 0 46896 0 7682140 0 0 0 74752 792 1526 1 6 49 43
 0 3 0 48996 0 7681420 0 0 0 79360 1103 2084 1 6 50 42
 0 3 0 45216 0 7684640 0 0 0 84480 824 1494 2 7 49 42
 1 3 0 46028 0 7684060 0 0 0 78336 1081 1981 1 7 16 76
 1 2 0 46960 0 7684032 0 0 0 82536 1138 2168 1 8 0 91
 0 3 0 50072 0 7680432 0 0 0 79768 760 1473 1 6 0 92
 1 2 0 47396 0 7683396 0 0 0 86680 966 1670 1 6 19 74
 1 3 0 48876 0 7681688 0 0 0 75624 758 1304 2 6 0 92
 0 3 0 50652 0 7680384 0 0 0 83456 983 1656 1 7 8 83
 0 3 0 45072 0 7684236 0 0 0 90624 1151 2103 1 7 47 45
 0 3 0 45308 0 7683464 0 0 0 80896 817 1380 1 6 46 46
 1 3 0 45936 0 7684280 0 0 0 73216 1049 1807 2 6 46 46
 2 2 0 45284 0 7685624 0 0 0 81008 881 1397 1 7 47 45
 0 3 0 47208 0 7683352 0 0 0 84405 1055 1642 1 7 47 45
 0 4 0 48368 0 7682056 0 0 0 76299 1049 1721 1 5 48 45

TEST 3 (all parallel - one hdd)
----------------------------------------------------------------------------
yura@suse:~> dd if=/dev/zero of=./bigfile4 bs=1M count=15000 (terminal 1)
15000+0 записей считано
15000+0 записей написано
 скопировано 15728640000 байт (16 GB), 481,226 c, 32,7 MB/c

yura@suse:~> dd if=/dev/zero of=./bigfile5 bs=1M count=15000 (terminal 2)
15000+0 записей считано
15000+0 записей написано
 скопировано 15728640000 байт (16 GB), 485,821 c, 32,4 MB/c

And at the same time
KDE Menu -> Dolphin -> click -> WAIT 1s -> Dolphin is opened

procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r b swpd free buff cache si so bi bo in cs us sy id wa
 2 5 0 44792 0 7682396 0 0 116 57368 1016 2083 3 6 0 91
 0 5 0 47988 0 7679356 0 0 140 45112 768 1116 2 4 0 94
 0 6 0 48080 0 7679688 0 0 744 57352 935 1410 1 5 0 94
 3 4 0 45584 0 7679752 0 0 1080 16396 1549 2173 2 3 0 95
 1 5 0 46408 0 7680768 0 0 4648 32 1364 1708 4 2 0 93
 0 6 0 46648 0 7680468 0 0 1080 32824 1052 1592 3 4 0 93
 0 6 0 44884 0 7681468 0 0 8 73453 852 1252 1 6 0 93
 0 5 0 48664 0 7676500 0 0 72 44126 825 1770 1 4 0 95
 0 6 0 44752 0 7678648 0 0 540 71215 1272 2865 2 6 0 92