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    SubjectRe: [reiserfs-list] Re: [PATCH] Preemption Latency Measurement Tool
    Date
    Hello Robert, all the others,

    here are my latest results.
    I've tried 2.4.10+preempt with some additional patches.
    Latest that I have applied was softirq-2.4.10-A7. But it all didn't fix my
    reported MP3 playback hiccup during dbench 16/32.

    See the numbers below.

    Regards,
    Dieter

    2.4.10+
    patch-rml-2.4.10-preempt-kernel-1+
    patch-rml-2.4.10-preempt-ptrace-and-jobs-fix+
    patch-rml-2.4.10-preempt-stats-1+
    inode.c-schedule.patch+
    journal.c-1-patch

    32 clients started
    .....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................++............................................+.......+++..+....+++..+...+.....+.++...+.++++.+++.++++++.+++********************************
    Throughput 38.6878 MB/sec (NB=48.3597 MB/sec 386.878 MBit/sec)
    14.200u 54.940s 1:50.21 62.7% 0+0k 0+0io 911pf+0w
    max load: 1777

    Version 1.92a ------Sequential Output------ --Sequential Input-
    --Random-
    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
    --Seeks--
    Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec
    %CP
    SunWave1 1248M 79 97 16034 21 5719 6 147 98 22904 16 269.0
    4
    Latency 138ms 2546ms 201ms 97838us 58940us 3207ms
    Version 1.92a ------Sequential Create------ --------Random
    Create--------
    SunWave1 -Create-- --Read--- -Delete-- -Create-- --Read---
    -Delete--
    files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
    %CP
    16 6121 75 +++++ +++ 12753 95 8422 80 +++++ +++ 11152
    95
    Latency 26126us 11425us 11879us 5325us 12082us 13025us
    1.92a,1.92a,SunWave1,1001286857,1248M,79,97,16034,21,5719,6,147,98,22904,16,269.0,4,16,,,,,6121,75,+++++,+++,12753,95,8422,80,+++++,+++,11152,95,138ms,2546ms,201ms,97838us,58940us,3207ms,26126us,11425us,11879us,5325us,12082us,13025us

    After running VTK (VIS app) I get this:

    Worst 20 latency times of 1648 measured in this period.
    usec cause mask start line/file address end line/file
    7239 spin_lock 1 381/memory.c c012808f 402/memory.c
    321 BKL 0 2754/buffer.c c01415ba 697/sched.c
    312 BKL 0 359/buffer.c c013d6dc 1381/sched.c
    280 BKL 0 359/buffer.c c013d6dc 1380/sched.c
    252 reacqBKL 0 1375/sched.c c0115334 1381/sched.c
    232 spin_lock 0 547/sched.c c0113574 697/sched.c
    215 eth1 0 585/irq.c c01089af 647/irq.c
    164 BKL 0 452/exit.c c011b4d1 681/tty_io.c
    119 BKL 0 1437/namei.c c014cabf 697/sched.c
    105 BKL 0 452/exit.c c011b4d1 697/sched.c
    101 BKL 5 712/tty_io.c c01a6edb 714/tty_io.c
    100 BKL 0 452/exit.c c011b4d1 1380/sched.c
    99 unknown 1 76/softirq.c c011cba4 119/softirq.c
    92 spin_lock 4 468/netfilter.c c01fe263 119/softirq.c
    79 BKL 0 42/file.c c01714b0 63/file.c
    72 BKL 0 752/namei.c c014b73f 697/sched.c
    71 BKL 0 533/inode.c c016e0ad 1381/sched.c
    71 BKL 0 30/inode.c c016d531 52/inode.c
    68 BKL 0 452/exit.c c011b4d1 1381/sched.c
    66 BKL 0 927/namei.c c014b94f 929/namei.c

    Adhoc c012808e <zap_page_range+5e/260>

    Do we need Rik's patch?

    ****************************************************************************

    2.4.10+
    patch-rml-2.4.10-preempt-kernel-1+
    patch-rml-2.4.10-preempt-ptrace-and-jobs-fix+
    patch-rml-2.4.10-preempt-stats-1+
    inode.c-schedule.patch+
    journal.c-1-patch+
    kupdated-patch

    32 clients started
    ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................+..........................................+.................+...........++.....................++.....++......+......+++++...++++++++.+++++++.++********************************
    Throughput 38.9015 MB/sec (NB=48.6269 MB/sec 389.015 MBit/sec)
    15.140u 60.640s 1:49.66 69.1% 0+0k 0+0io 911pf+0w
    max load: 1654

    Version 1.92a ------Sequential Output------ --Sequential Input-
    --Random-
    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
    --Seeks--
    Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec
    %CP
    SunWave1 1248M 84 99 16348 21 5746 6 142 99 23411 17 265.9
    4
    Latency 130ms 1868ms 192ms 88459us 54625us 3367ms
    Version 1.92a ------Sequential Create------ --------Random
    Create--------
    SunWave1 -Create-- --Read--- -Delete-- -Create-- --Read---
    -Delete--
    files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
    %CP
    16 4941 65 +++++ +++ 12916 96 6847 76 +++++ +++ 10785
    94
    Latency 8468us 11334us 11736us 8520us 12205us 12856us
    1.92a,1.92a,SunWave1,1001358471,1248M,84,99,16348,21,5746,6,142,99,23411,17,265.9,4,16,,,,,4941,65,+++++,+++,12916,96,6847,76,+++++,+++,10785,94,130ms,1868ms,192ms,88459us,54625us,3367ms,8468us,11334us,11736us,8520us,12205us,12856us

    Dbench run during MP3 playback:
    32 clients started
    .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................+.........+.........................................+.+.....+...............+...........................................................................+...................++...........+.+.......+..++++.++.+.++.++++++.+++++********************************
    Throughput 34.7025 MB/sec (NB=43.3782 MB/sec 347.025 MBit/sec)
    15.290u 63.820s 2:02.74 64.4% 0+0k 0+0io 911pf+0w

    Worst 20 latency times of 16578 measured in this period.
    usec cause mask start line/file address end line/file
    26795 spin_lock 1 291/buffer.c c0141a2c 280/buffer.c
    17330 spin_lock 1 341/vmscan.c c0133f0a 402/vmscan.c
    12925 spin_lock 1 439/vmscan.c c0133ea5 338/vmscan.c
    11923 spin_lock 1 291/buffer.c c0141a2c 285/buffer.c
    7253 BKL 0 1302/inode.c c016faa9 1381/sched.c
    7117 BKL 1 1302/inode.c c016faa9 697/sched.c
    6097 BKL 0 1302/inode.c c016faa9 1380/sched.c
    6000 BKL 1 533/inode.c c016e11d 697/sched.c
    4870 reacqBKL 1 1375/sched.c c0115334 929/namei.c
    4015 spin_lock 0 439/vmscan.c c0133ea5 402/vmscan.c
    2075 BKL 1 452/exit.c c011b4d1 697/sched.c
    2029 spin_lock 1 547/sched.c c0113574 697/sched.c
    2010 BKL 0 1302/inode.c c016faa9 842/inode.c
    1730 BKL 0 2754/buffer.c c01415ba 2757/buffer.c
    1668 BKL 1 2754/buffer.c c01415ba 697/sched.c
    1574 spin_lock 0 483/dcache.c c01545da 520/dcache.c
    1416 spin_lock 0 1376/sched.c c0115353 1380/sched.c
    1396 spin_lock 1 1376/sched.c c0115353 697/sched.c
    1387 aic7xxx 1 76/softirq.c c011cba4 119/softirq.c
    1341 BKL 1 533/inode.c c016e11d 842/inode.c

    Adhoc c0141a2c <kupdate+11c/210>
    Adhoc c0133f0a <shrink_cache+37a/5b0>
    Adhoc c0133ea4 <shrink_cache+314/5b0>
    Adhoc c0141a2c <kupdate+11c/210>
    Adhoc c016faa8 <reiserfs_dirty_inode+58/f0>
    Adhoc c016faa8 <reiserfs_dirty_inode+58/f0>
    Adhoc c016faa8 <reiserfs_dirty_inode+58/f0>
    Adhoc c016e11c <reiserfs_get_block+9c/f30>
    Adhoc c0115334 <preempt_schedule+34/b0>
    Adhoc c0133ea4 <shrink_cache+314/5b0>
    Adhoc c011b4d0 <do_exit+130/360>
    Adhoc c0113574 <schedule+34/550>
    Adhoc c016faa8 <reiserfs_dirty_inode+58/f0>
    Adhoc c01415ba <sync_old_buffers+2a/130>
    Adhoc c01415ba <sync_old_buffers+2a/130>
    Adhoc c01545da <select_parent+3a/100>
    Adhoc c0115352 <preempt_schedule+52/b0>
    Adhoc c0115352 <preempt_schedule+52/b0>
    Adhoc c011cba4 <do_softirq+34/150>
    Adhoc c016e11c <reiserfs_get_block+9c/f30>

    Redo after some seconds:

    Worst 20 latency times of 1944 measured in this period.
    usec cause mask start line/file address end line/file
    2028 BKL 1 1302/inode.c c016faa9 697/sched.c
    584 BKL 0 1302/inode.c c016faa9 1306/inode.c
    572 spin_lock 0 1376/sched.c c0115353 1380/sched.c
    415 BKL 0 1302/inode.c c016faa9 1381/sched.c
    356 BKL 0 2754/buffer.c c01415ba 2757/buffer.c
    353 BKL 0 2754/buffer.c c01415ba 697/sched.c
    328 BKL 0 2754/buffer.c c01415ba 1381/sched.c
    278 spin_lock 0 381/memory.c c012808f 402/memory.c
    274 reacqBKL 0 1375/sched.c c0115334 1381/sched.c
    245 spin_lock 0 547/sched.c c0113574 697/sched.c
    208 eth1 0 585/irq.c c01089af 647/irq.c
    188 BKL 1 301/namei.c c014a4b1 697/sched.c
    176 BKL 1 927/namei.c c014b9bf 929/namei.c
    161 BKL 0 301/namei.c c014a4b1 1380/sched.c
    154 BKL 0 533/inode.c c016e11d 842/inode.c
    147 BKL 6 712/tty_io.c c01a6f6b 714/tty_io.c
    141 BKL 0 301/namei.c c014a4b1 1381/sched.c
    141 BKL 0 30/inode.c c016d5a1 52/inode.c
    126 reacqBKL 0 1375/sched.c c0115334 2757/buffer.c
    121 reacqBKL 0 1375/sched.c c0115334 929/namei.c

    Adhoc c016faa8 <reiserfs_dirty_inode+58/f0>
    Adhoc c016faa8 <reiserfs_dirty_inode+58/f0>
    Adhoc c0115352 <preempt_schedule+52/b0>
    Adhoc c016faa8 <reiserfs_dirty_inode+58/f0>
    Adhoc c01415ba <sync_old_buffers+2a/130>
    Adhoc c01415ba <sync_old_buffers+2a/130>
    Adhoc c01415ba <sync_old_buffers+2a/130>
    Adhoc c012808e <zap_page_range+5e/260>
    Adhoc c0115334 <preempt_schedule+34/b0>
    Adhoc c0113574 <schedule+34/550>
    Adhoc c01089ae <do_IRQ+3e/1d0>
    Adhoc c014a4b0 <real_lookup+70/150>
    Adhoc c014b9be <vfs_create+ae/150>
    Adhoc c014a4b0 <real_lookup+70/150>
    Adhoc c016e11c <reiserfs_get_block+9c/f30>
    Adhoc c01a6f6a <tty_write+21a/2f0>
    Adhoc c014a4b0 <real_lookup+70/150>
    Adhoc c016d5a0 <reiserfs_delete_inode+30/110>
    Adhoc c0115334 <preempt_schedule+34/b0>
    Adhoc c0115334 <preempt_schedule+34/b0>

    ****************************************************************************

    2.4.10+
    patch-rml-2.4.10-preempt-kernel-1+
    patch-rml-2.4.10-preempt-ptrace-and-jobs-fix+
    patch-rml-2.4.10-preempt-stats-1+
    inode.c-schedule.patch+
    journal.c-1-patch+
    kupdated-patch+
    00_vm-tweaks-1

    32 clients started
    ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................+......................................+..+...+...+...............+...+...................+.....+++...+.++.+.+..+++++.+...++++++++++********************************
    Throughput 37.9905 MB/sec (NB=47.4881 MB/sec 379.905 MBit/sec)
    14.810u 62.280s 1:52.26 68.6% 0+0k 0+0io 911pf+0w
    max load: 1764

    Version 1.92a ------Sequential Output------ --Sequential Input-
    --Random-
    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
    --Seeks--
    Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec
    %CP
    SunWave1 1248M 87 98 16359 21 5839 6 155 99 23709 16 275.7
    4
    Latency 247ms 2351ms 191ms 84684us 67700us 3791ms
    Version 1.92a ------Sequential Create------ --------Random
    Create--------
    SunWave1 -Create-- --Read--- -Delete-- -Create-- --Read---
    -Delete--
    files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
    %CP
    16 5545 52 +++++ +++ 13434 95 5138 67 +++++ +++ 11297
    95
    Latency 4894us 11251us 11868us 4922us 12265us 12863us
    1.92a,1.92a,SunWave1,1001467140,1248M,87,98,16359,21,5839,6,155,99,23709,16,275.7,4,16,,,,,5545,52,+++++,+++,13434,95,5138,67,+++++,+++,11297,95,247ms,2351ms,191ms,84684us,67700us,3791ms,4894us,11251us,11868us,4922us,12265us,12863us

    Dbench run during MP3 playback:
    32 clients started
    .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................++..........+.+..+..............................................+...................................................+.....+..........+.....+.+..++++.+..+....+++++++.+.++++.+++********************************
    Throughput 36.1736 MB/sec (NB=45.217 MB/sec 361.736 MBit/sec)
    14.920u 61.240s 1:57.82 64.6% 0+0k 0+0io 911pf+0w

    Worst 20 latency times of 19595 measured in this period.
    usec cause mask start line/file address end line/file
    40920 spin_lock 1 291/buffer.c c0141a5c 280/buffer.c
    16812 spin_lock 1 443/vmscan.c c0133eb5 340/vmscan.c
    8114 BKL 1 533/inode.c c016e14d 697/sched.c
    7932 spin_lock 1 443/vmscan.c c0133eb5 406/vmscan.c
    6886 BKL 1 1302/inode.c c016fad9 697/sched.c
    6660 BKL 0 1302/inode.c c016fad9 1306/inode.c
    6260 spin_lock 1 343/vmscan.c c0133f1a 406/vmscan.c
    4273 BKL 1 1302/inode.c c016fad9 842/inode.c
    2410 reacqBKL 1 1375/sched.c c0115334 697/sched.c
    2153 reacqBKL 0 1375/sched.c c0115334 1381/sched.c
    1876 BKL 0 452/exit.c c011b4d1 697/sched.c
    1609 spin_lock 1 483/dcache.c c015460a 520/dcache.c
    1536 BKL 0 2754/buffer.c c01415ea 2757/buffer.c
    1533 spin_lock 0 291/buffer.c c0141a5c 285/buffer.c
    1311 BKL 0 2754/buffer.c c01415ea 1380/sched.c
    1308 spin_lock 0 547/sched.c c0113574 697/sched.c
    1286 BKL 1 533/inode.c c016e14d 842/inode.c
    1222 BKL 0 30/inode.c c016d5d1 52/inode.c
    1110 BKL 0 2754/buffer.c c01415ea 1381/sched.c
    850 spin_lock 1 1376/sched.c c0115353 1380/sched.c

    Adhoc c0141a5c <kupdate+11c/210>
    Adhoc c0133eb4 <shrink_cache+2f4/590>
    Adhoc c016e14c <reiserfs_get_block+9c/f30>
    Adhoc c0133eb4 <shrink_cache+2f4/590>
    Adhoc c016fad8 <reiserfs_dirty_inode+58/f0>
    Adhoc c016fad8 <reiserfs_dirty_inode+58/f0>
    Adhoc c0133f1a <shrink_cache+35a/590>
    Adhoc c016fad8 <reiserfs_dirty_inode+58/f0>
    Adhoc c0115334c0115334 <END_OF_CODE+c0115333d122a04e/????>
    Adhoc c011b4d0 <do_exit+130/360>
    Adhoc c015460a <select_parent+3a/100>
    Adhoc c01415ea <sync_old_buffers+2a/130>
    Adhoc c0141a5c <kupdate+11c/210>
    Adhoc c01415ea <sync_old_buffers+2a/130>
    Adhoc c0113574 <schedule+34/550>
    Adhoc c016e14c <reiserfs_get_block+9c/f30>
    Adhoc c016d5d0 <reiserfs_delete_inode+30/110>
    Adhoc c01415ea <sync_old_buffers+2a/130>
    Adhoc c0115352 <preempt_schedule+52/b0>

    SunWave1#free -t
    total used free shared buffers cached
    Mem: 642824 168212 474612 0 11404 47612
    -/+ buffers/cache: 109196 533628
    Swap: 0 0 0
    Total: 642824 168212 474612

    SunWave1#cat /proc/meminfo
    total: used: free: shared: buffers: cached:
    Mem: 658251776 172527616 485724160 0 11677696 49016832
    Swap: 0 0 0
    MemTotal: 642824 kB
    MemFree: 474340 kB
    MemShared: 0 kB
    Buffers: 11404 kB
    Cached: 47868 kB
    SwapCached: 0 kB
    Active: 37356 kB
    Inactive: 21916 kB
    HighTotal: 0 kB
    HighFree: 0 kB
    LowTotal: 642824 kB
    LowFree: 474340 kB
    SwapTotal: 0 kB
    SwapFree: 0 kB

    ****************************************************************************

    2.4.10+
    patch-rml-2.4.10-preempt-kernel-1+
    patch-rml-2.4.10-preempt-ptrace-and-jobs-fix+
    patch-rml-2.4.10-preempt-stats-1+
    inode.c-schedule.patch+
    journal.c-1-patch+
    kupdated-patch+
    00_vm-tweaks-2+
    softirq-2.4.10-A7

    32 clients started
    ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................+............+.....................................+...+................................+.....................+........+..+++..+++...+++++++..+++++.++++.+++********************************
    Throughput 38.061 MB/sec (NB=47.5762 MB/sec 380.61 MBit/sec)
    14.850u 60.210s 1:52.00 67.0% 0+0k 0+0io 911pf+0w
    max load: 1872

    Version 1.92a ------Sequential Output------ --Sequential Input-
    --Random-
    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
    --Seeks--
    Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec
    %CP
    SunWave1 1248M 86 99 16238 21 5950 6 160 99 23612 16 270.9
    4
    Latency 186ms 1905ms 170ms 81429us 58393us 2869ms
    Version 1.92a ------Sequential Create------ --------Random
    Create--------
    SunWave1 -Create-- --Read--- -Delete-- -Create-- --Read---
    -Delete--
    files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
    %CP
    16 5351 51 +++++ +++ 13298 94 8670 82 +++++ +++ 11260
    95
    Latency 7799us 11631us 11649us 4801us 12097us 12804us
    1.92a,1.92a,SunWave1,1001546561,1248M,86,99,16238,21,5950,6,160,99,23612,16,270.9,4,16,,,,,5351,51,+++++,+++,13298,94,8670,82,+++++,+++,11260,95,186ms,1905ms,170ms,81429us,58393us,2869ms,7799us,11631us,11649us,4801us,12097us,12804us

    Dbench run during MP3 playback:
    SunWave1>time ./dbench 32
    32 clients started
    ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................+.+.+................++.....+........+......................+...................+++.+...........+........+.......++..+++.+..++.+.++...++++.+.+.........+********************************
    Throughput 37.9649 MB/sec (NB=47.4562 MB/sec 379.649 MBit/sec)
    14.900u 61.430s 1:52.34 67.9% 0+0k 0+0io 911pf+0w

    Worst 20 latency times of 13895 measured in this period.
    usec cause mask start line/file address end line/file
    32066 spin_lock 1 291/buffer.c c0141aac 285/buffer.c
    13058 spin_lock 1 443/vmscan.c c0133f05 340/vmscan.c
    10875 spin_lock 1 343/vmscan.c c0133f6a 340/vmscan.c
    9627 spin_lock 1 291/buffer.c c0141aac 280/buffer.c
    7310 spin_lock 0 343/vmscan.c c0133f6a 406/vmscan.c
    7003 BKL 1 1302/inode.c c016fb29 1402/sched.c
    6906 BKL 0 1302/inode.c c016fb29 719/sched.c
    6723 BKL 0 1302/inode.c c016fb29 1306/inode.c
    4036 BKL 1 1302/inode.c c016fb29 842/inode.c
    3978 BKL 1 533/inode.c c016e19d 842/inode.c
    3636 BKL 1 30/inode.c c016d621 52/inode.c
    3359 reacqBKL 1 1397/sched.c c01153f4 52/inode.c
    3005 BKL 1 452/exit.c c011b591 719/sched.c
    2137 reacqBKL 1 1397/sched.c c01153f4 929/namei.c
    2064 spin_lock 0 443/vmscan.c c0133f05 406/vmscan.c
    1776 reacqBKL 1 1397/sched.c c01153f4 719/sched.c
    1695 spin_lock 0 569/sched.c c0113634 719/sched.c
    1557 spin_lock 0 483/dcache.c c015465a 520/dcache.c
    1385 BKL 1 2754/buffer.c c014163a 2757/buffer.c
    1324 spin_lock 0 1398/sched.c c0115413 719/sched.c

    Adhoc c0141aac <kupdate+11c/210>
    Adhoc c0133f04 <shrink_cache+2f4/590>
    Adhoc c0133f6a <shrink_cache+35a/590>
    Adhoc c0141aac <kupdate+11c/210>
    Adhoc c0133f6a <shrink_cache+35a/590>
    Adhoc c016fb28 <reiserfs_dirty_inode+58/f0>
    Adhoc c016fb28 <reiserfs_dirty_inode+58/f0>
    Adhoc c016fb28 <reiserfs_dirty_inode+58/f0>
    Adhoc c016fb28 <reiserfs_dirty_inode+58/f0>
    Adhoc c016e19c <reiserfs_get_block+9c/f30>
    Adhoc c016d620 <reiserfs_delete_inode+30/110>
    Adhoc c01153f4 <preempt_schedule+34/b0>
    Adhoc c011b590 <do_exit+130/360>
    Adhoc c01153f4 <preempt_schedule+34/b0>
    Adhoc c0133f04 <shrink_cache+2f4/590>
    Adhoc c01153f4 <preempt_schedule+34/b0>
    Adhoc c0113634 <schedule+34/550>
    Adhoc c015465a <select_parent+3a/100>
    Adhoc c014163a <sync_old_buffers+2a/130>
    Adhoc c0115412 <preempt_schedule+52/b0>
    -
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