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Message-ID: <20090326141323.GA13048@elte.hu> Date: Thu, 26 Mar 2009 15:13:23 +0100 From: Ingo Molnar <mingo@...e.hu> To: Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Alan Cox <alan@...rguk.ukuu.org.uk>, Arjan van de Ven <arjan@...radead.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Nick Piggin <npiggin@...e.de>, Jens Axboe <jens.axboe@...cle.com>, David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Oleg Nesterov <oleg@...hat.com>, Roland McGrath <roland@...hat.com> Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29) > > Then could you grab /proc/fs/jbd2/<dev>:8/history and > > /proc/fs/jbd2/<dev>:8/info while running your test workload? grabbed them after the tests. (not much else ran before and after the tests) Here they are: R/C tid wait run lock flush log hndls block inlog ctime write drop close R 642267 0 5000 0 84 3288 76104 560 562 R 642268 0 5000 956 2024 5760 68891 491 493 R 642269 956 7788 8 5104 6696 182270 667 669 R 642270 8 11800 216 7000 6816 186159 834 837 R 642271 60 13816 0 0 492 45115 2162 2169 R 642272 0 5000 0 0 2144 44278 1266 1270 R 642273 0 5000 0 80 3144 73604 444 446 R 642274 0 5000 0 276 3120 71741 488 490 R 642275 0 5000 0 288 3608 87334 526 528 R 642276 0 5000 0 112 2992 83061 512 514 R 642277 0 5000 0 84 5892 75029 468 470 R 642278 0 5976 0 848 8564 71693 483 485 R 642279 0 9412 340 5432 7104 167415 664 666 R 642280 340 12536 0 8764 3820 270409 906 909 R 642281 0 12584 0 0 576 38603 2175 2182 R 642282 0 5000 0 16 2620 51638 1275 1279 R 642283 0 5000 0 16 2364 58962 376 378 R 642284 0 5000 0 56 2812 66644 442 444 R 642285 0 5000 0 64 2744 61323 479 481 R 642286 0 5000 0 16 2328 61109 439 441 R 642287 0 5000 0 40 2752 69227 471 473 R 642288 0 5000 0 20 2536 60836 454 456 R 642289 0 5000 0 16 2612 63580 440 442 R 642290 0 5000 0 48 2528 72629 463 465 R 642291 0 5000 0 68 2848 75262 498 500 R 642292 0 5000 0 60 2688 77164 468 470 R 642293 0 5000 0 0 2188 60922 458 460 R 642294 0 5000 0 348 3124 79928 528 530 R 642295 0 5100 0 1896 3128 62695 672 674 R 642296 0 5024 0 8 4840 17110 90 91 R 642297 0 5000 0 0 816 14232 1534 1539 R 642298 0 5000 0 0 2636 52309 2070 2077 R 642299 0 5000 0 60 2936 67005 375 377 R 642300 0 5000 0 0 2064 52821 374 376 R 642301 0 5000 0 228 3344 85321 539 541 R 642302 0 5000 0 24 5360 54421 458 460 R 642303 0 5384 52 1388 6548 66593 452 454 R 642304 52 7936 876 7316 3832 192877 640 642 R 642305 876 11152 0 5620 3656 262638 821 824 R 642306 0 9276 0 6172 3768 125379 806 809 R 642307 0 9920 0 0 6256 11091 702 705 R 642308 0 5636 0 0 4976 266 119 120 R 642309 0 5004 0 0 432 11035 1894 1900 R 642310 0 5000 0 0 2608 43443 1270 1274 R 642311 0 5000 0 36 2204 55368 333 334 R 642312 0 5000 0 224 3180 77649 476 478 R 642313 0 5000 0 20 2496 65989 431 433 R 642314 0 5000 0 36 2512 71443 466 468 R 642315 0 5000 956 1796 3916 62650 460 462 R 642316 956 5712 0 1608 3676 136304 581 583 R 642317 0 5284 0 1732 3704 123922 572 574 R 642318 0 5436 0 2032 3652 133710 610 612 R 642319 0 5684 0 1496 3652 129017 622 624 R 642320 0 5148 0 640 3304 36529 602 604 R 642321 0 5004 0 580 5404 23212 216 217 R 642322 0 5980 0 0 272 4878 149 150 R 642323 0 5000 0 0 1408 32432 2803 2812 R 642324 0 5000 0 1184 3416 94751 420 422 R 642325 0 5000 0 592 3260 94208 502 504 R 642326 0 5000 0 92 3648 88419 486 488 R 642327 0 5000 0 80 3052 76222 489 491 R 642328 0 5000 0 0 4460 60005 429 431 R 642329 0 5000 1108 2408 6260 77172 426 428 R 642330 1108 8668 4 4992 3356 166166 622 624 R 642331 0 8340 0 0 120 75 62 63 R 642332 0 6984 0 0 68 51 14 15 R 642333 0 6072 0 0 72 35 14 15 R 642334 0 6072 0 0 80 31 12 13 R 642335 0 5732 0 0 84 49 15 16 R 642336 0 5684 0 0 68 31 12 13 R 642337 0 5612 0 0 72 36 14 15 R 642338 0 5636 0 0 68 35 15 16 R 642339 0 5564 0 0 48 8 3 4 R 642340 0 6224 0 0 4136 7 8 9 R 642341 0 5596 0 0 100 11 13 14 R 642342 0 5660 0 0 156 31 11 12 R 642343 0 5752 0 0 76 24 12 13 R 642344 0 5088 0 0 60 12 4 5 R 642345 0 5032 0 0 40 8 3 4 R 642346 0 5440 0 0 36 16 4 5 R 642347 0 8616 0 0 44 13 4 5 R 642348 0 5284 0 0 44 7 4 5 R 642349 0 5444 0 0 56 8 4 5 R 642350 0 5292 0 0 36 8 4 5 R 642351 0 5140 0 0 44 4 3 4 R 642352 0 5452 0 0 80 26 7 8 R 642353 0 11144 0 0 108 5 3 4 R 642354 0 5692 0 0 36 5 3 4 R 642355 0 5520 0 0 40 4 3 4 R 642356 0 5376 0 0 40 5 3 4 R 642357 0 5228 0 0 44 4 3 4 R 642358 0 5080 0 0 44 5 3 4 R 642359 0 17148 0 0 48 6 3 4 R 642360 0 18148 0 0 44 4 3 4 R 642361 0 5064 0 0 64 12 4 5 R 642362 0 5560 0 0 64 33 13 14 R 642363 0 5228 0 0 36 7 4 5 R 642364 0 5096 0 0 40 3 3 4 R 642365 0 8136 0 0 64 19 8 9 R 642366 0 9140 0 0 64 9 4 5 312 transaction, each upto 8192 blocks average: 52ms waiting for transaction 5692ms running transaction 52ms transaction was being locked 728ms flushing data (in ordered mode) 2748ms logging transaction 51724us average transaction commit time 61570 handles per transaction 565 blocks per transaction 567 logged blocks per transaction (Hopefully i captured them the right way - should i have done this while the test was going on?) 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