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Message-ID: <64bb37e0711011200n228e708eg255640388f83da22@mail.gmail.com> Date: Thu, 1 Nov 2007 20:00:10 +0100 From: "Torsten Kaiser" <just.for.lkml@...glemail.com> To: "Fengguang Wu" <wfg@...l.ustc.edu.cn> Cc: "Maxim Levitsky" <maximlevitsky@...il.com>, "Peter Zijlstra" <peterz@...radead.org>, linux-kernel@...r.kernel.org, "Andrew Morton" <akpm@...ux-foundation.org> Subject: Re: 100% iowait on one of cpus in current -git On 11/1/07, Torsten Kaiser <just.for.lkml@...glemail.com> wrote: > On 11/1/07, Fengguang Wu <wfg@...l.ustc.edu.cn> wrote: > > Thank you. Maybe we can start by the applied debug patch :-) > > Will applied it and try to recreate this. Patch applied, used emerge to install a 2.6.24-rc1 kernel. I had no complete stalls, but three times during the move from tmpfs to the main xfs the emerge got noticeable slower. There still was writeout happening, but as emerge prints out every file it has written during the pause not one file was processed. vmstat 10: procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 1 0 3146424 332 614768 0 0 134 1849 438 2515 3 4 91 2 0 0 0 3146644 332 614784 0 0 2 1628 507 646 0 2 85 13 0 0 0 3146868 332 614868 0 0 5 2359 527 1076 0 3 97 0 1 0 0 3144372 332 616148 0 0 96 2829 607 2666 2 5 92 0 -> normal writeout 0 0 0 3140560 332 618144 0 0 152 2764 633 3308 3 6 91 0 0 0 0 3137332 332 619908 0 0 114 1801 588 2858 3 4 93 0 0 0 0 3136912 332 620136 0 0 20 827 393 1605 1 2 98 0 -> first stall 0 0 0 3137088 332 620136 0 0 0 557 339 1437 0 1 99 0 0 0 0 3137160 332 620136 0 0 0 642 310 1400 0 1 99 0 0 0 0 3136588 332 620172 0 0 6 2972 527 1195 0 3 80 16 0 0 0 3136276 332 620348 0 0 10 2668 558 1195 0 3 96 0 0 0 0 3135228 332 620424 0 0 8 2712 522 1311 0 4 96 0 0 0 0 3131740 332 621524 0 0 75 2935 559 2457 2 5 93 0 0 0 0 3128348 332 622972 0 0 85 1470 490 2607 3 4 93 0 0 0 0 3129292 332 622972 0 0 0 527 353 1398 0 1 99 0 -> second longer stall 0 0 0 3128520 332 623028 0 0 6 488 249 1390 0 1 99 0 0 0 0 3128236 332 623028 0 0 0 482 222 1222 0 1 99 0 0 0 0 3128408 332 623028 0 0 0 585 269 1301 0 0 99 0 0 0 0 3128532 332 623028 0 0 0 610 262 1278 0 0 99 0 0 0 0 3128568 332 623028 0 0 0 636 345 1639 0 1 99 0 0 0 0 3129032 332 623040 0 0 1 664 337 1466 0 1 99 0 0 0 0 3129484 332 623040 0 0 0 658 300 1508 0 0 100 0 0 0 0 3129576 332 623040 0 0 0 562 271 1454 0 1 99 0 0 0 0 3129736 332 623040 0 0 0 627 278 1406 0 1 99 0 0 0 0 3129368 332 623040 0 0 0 507 274 1301 0 1 99 0 0 0 0 3129004 332 623040 0 0 0 444 211 1213 0 0 99 0 0 1 0 3127260 332 623040 0 0 0 1036 305 1242 0 1 95 4 0 0 0 3126280 332 623128 0 0 7 4241 555 1575 1 5 84 10 0 0 0 3124948 332 623232 0 0 6 4194 529 1505 1 4 95 0 0 0 0 3125228 332 624168 0 0 58 1966 586 1964 2 4 94 0 -> emerge resumed to normal speed, without any intervention from my side 0 0 0 3120932 332 625904 0 0 112 1546 546 2565 3 4 93 0 0 0 0 3118012 332 627568 0 0 128 1542 612 2705 3 4 93 0 >From syslog: first stall: [ 575.050000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 47259 global 610 0 0 wc __ tw 1023 sk 0 [ 586.350000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 50465 global 6117 0 0 wc _M tw 967 sk 0 [ 586.360000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 50408 global 6117 0 0 wc __ tw 1022 sk 0 [ 599.900000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 53523 global 11141 0 0 wc __ tw 1009 sk 0 [ 635.780000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 59397 global 12757 124 0 wc __ tw 0 sk 0 [ 638.470000] mm/page-writeback.c 418 balance_dirty_pages: emerge(6113) 1536 global 11405 51 0 wc __ tw 0 sk 0 [ 638.820000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 58373 global 11276 48 0 wc __ tw -1 sk 0 [ 641.260000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 57348 global 10565 100 0 wc __ tw 0 sk 0 [ 643.980000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 56324 global 9788 103 0 wc __ tw -1 sk 0 [ 646.120000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 55299 global 8912 6 0 wc __ tw 0 sk 0 second stall: [ 664.040000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 48117 global 2864 81 0 wc _M tw -13 sk 0 [ 664.400000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 47080 global 1995 137 0 wc _M tw 176 sk 0 [ 664.510000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 46232 global 1929 267 0 wc __ tw 880 sk 0 cron[6927]: (root) CMD (test -x /usr/sbin/run-crons && /usr/sbin/run-crons ) [ 809.560000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 49422 global 19166 217 0 wc _M tw 380 sk 0 [ 811.720000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 48778 global 17969 407 0 wc _M tw -4 sk 0 [ 813.880000] mm/page-writeback.c 418 balance_dirty_pages: emerge(6113) 1537 global 16592 233 0 wc _M tw -1 sk 0 [ 814.710000] mm/page-writeback.c 418 balance_dirty_pages: find(6931) 1537 global 16132 179 0 wc __ tw -1 sk 0 [ 814.720000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 47750 global 16040 271 0 wc _M tw -1 sk 0 [ 815.040000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 46725 global 15403 779 0 wc CM tw 324 sk 0 the third stall happend after the emerge was finished. There still was ~120Mb of dirty data, but its writeout got much slower over several seconds. vmstat 10: procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 0 3096152 332 630424 0 0 81 1503 640 2771 5 4 91 0 0 0 0 3101024 332 631588 0 0 279 473 510 1281 5 2 92 1 -> stall / slowdown starts 0 0 0 3147924 332 632384 0 0 78 626 449 1384 0 1 99 0 1 0 0 3147940 332 632384 0 0 0 611 388 1387 0 1 99 0 0 1 0 3147576 332 632384 0 0 0 939 449 1432 0 1 99 0 0 0 0 3145476 332 632384 0 0 0 3592 644 925 0 4 93 3 -> writeout resumes full speed 0 0 0 3147232 332 632480 0 0 0 3108 678 1053 0 3 97 0 0 0 0 3146860 332 632480 0 0 0 2497 677 859 0 3 97 0 0 0 0 3146720 332 632480 0 0 0 2433 648 839 0 3 97 0 0 0 0 3147844 332 632484 0 0 0 2394 625 889 0 3 97 0 0 0 0 3148128 332 632484 0 0 0 2204 671 848 0 2 97 0 from syslog: [ 848.070000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 48084 global 13805 0 0 wc _M tw 1008 sk 0 [ 848.080000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 48068 global 13805 0 0 wc __ tw 1020 sk 0 [ 884.090000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 61811 global 30297 2 0 wc __ tw 862 sk 0 [ 921.760000] mm/page-writeback.c 418 balance_dirty_pages: cat(7170) 1541 global 28113 391 0 wc __ tw -5 sk 0 -> that cat was probably my watch cat /proc/meminfo -> during the stall there where no updates visible there [ 922.190000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 76871 global 27735 0 0 wc __ tw -5 sk 0 [ 923.550000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 75842 global 26688 106 0 wc _M tw -1 sk 0 [ 924.940000] mm/page-writeback.c 655 wb_kupdate: pdflush(285) 74817 global 25698 195 0 wc _M tw 0 sk 0 Apart from my normal kde desktop (no compiz) and the emerge the system was idle. If I see the complete stall again, I will post that too. Torsten - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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