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Message-Id: <1359524809.5789.140661184325217.261ED7C8@webmail.messagingengine.com> Date: Wed, 30 Jan 2013 16:46:49 +1100 From: Bron Gondwana <brong@...tmail.fm> To: linux-ext4@...r.kernel.org Cc: Rob Mueller <robm@...tmail.fm> Subject: fallocate creating fragmented files Hi All, I'm trying to understand why my ext4 filesystem is creating highly fragmented files even though it's only just over 50% full. The hardware is 2 x 64Gb Intel x25e drives in software RAID1 as /dev/md0: [brong@...p14 conf]$ cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdf[0] sdg[1] 62522624 blocks [2/2] [UU] unused devices: <none> [brong@...p14 conf]$ df | grep md0 /dev/md0 58594701 30996530 24472040 56% /mnt/ssd14 It's mounted data=ordered: [brong@...p14 conf]$ mount | grep md0 /dev/md0 on /mnt/ssd14 type ext4 (rw,noatime,data=ordered,barrier=0,commit=120) The filesystem was created with 1k blocks, nearly 2 years ago. It's seen a lot of usage since then, but never been super-full. [brong@...p14 conf]$ dumpe2fs -h /dev/md0 dumpe2fs 1.42.4 (12-Jun-2012) Filesystem volume name: <none> Last mounted on: /mnt/ssd14 Filesystem UUID: f10d5f08-a4b5-476f-9568-586ca0b793b5 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 15632384 Block count: 62522624 Reserved block count: 3126131 Free blocks: 26483551 Free inodes: 13674200 First block: 1 Block size: 1024 Fragment size: 1024 Reserved GDT blocks: 256 Blocks per group: 8192 Fragments per group: 8192 Inodes per group: 2048 Inode blocks per group: 512 Flex block group size: 16 Filesystem created: Tue Mar 8 08:30:35 2011 Last mount time: Thu Jan 24 20:05:50 2013 Last write time: Thu Jan 24 20:05:50 2013 Mount count: 10 Maximum mount count: 24 Last checked: Fri May 13 09:10:27 2011 Check interval: 15552000 (6 months) Next check after: Wed Nov 9 08:10:27 2011 Lifetime writes: 33 TB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 First orphan inode: 14256056 Default directory hash: half_md4 Directory Hash Seed: 2f49b7f2-f4f7-464a-b804-8598867da2ba Journal backup: inode blocks Journal features: journal_incompat_revoke Journal size: 32M Journal length: 32768 Journal sequence: 0xcfc0f41e Journal start: 16226 ---------------------------- Now we've got some background, let's create two files using the fallocate command line tool, and see where the blocks wound up. This mirrors exactly the behaviour we have seen with both using posix_fallocate to pre-allocate space, or just using seek and writev to write individual records out to the file. Except with the slower writes of a real application, we get closer to 9000 extents for a file this size. [brong@...p14 conf]$ fallocate -l 20m testfile [brong@...p14 conf]$ fallocate -l 20m testfile2 [brong@...p14 conf]$ filefrag testfile testfile: 421 extents found [brong@...p14 conf]$ filefrag testfile2 testfile2: 306 extents found Now looking at the verbose output, we can see that there are many extents of just 3 or 4 blocks: [brong@...p14 conf]$ filefrag -v testfile | awk '{print $5}' | sort -n | uniq -c | head 2 1 is 1 length 1 unwritten 6 3 10 4 6 5 5 6 3 7 1 8 Yet looking at the next file, [brong@...p14 conf]$ filefrag -v testfile2 | awk '{print $5}' | sort -n | uniq -c | tail 1 173 1 175 1 178 1 184 1 187 1 189 1 194 1 289 1 321 1 330 There are multiple extents of hundreds of blocks in length. Why weren't they used in allocating the first file? This filesystem is quite busy all the time. There are hundreds of imapd processes all locking and writing to it, including a lot of fdatasync and fsync calls. During the time it took to run this command, there would have been multiple fsyncs. I can't see why that would affect the allocator in this way for a single fallocate call though. Regards, Bron. (full filefrag dump for testfile follows:) [brong@...p14 conf]$ filefrag -v testfile Filesystem type is: ef53 File size of testfile is 20971520 (20480 blocks, blocksize 1024) ext logical physical expected length flags 0 0 13545000 48 unwritten 1 48 13545134 13545048 48 unwritten 2 96 13545357 13545182 48 unwritten 3 144 13545431 13545405 48 unwritten 4 192 13546319 13545479 48 unwritten 5 240 13546936 13546367 48 unwritten 6 288 13542294 13546984 47 unwritten 7 335 13542391 13542341 47 unwritten 8 382 13542478 13542438 47 unwritten 9 429 13542719 13542525 47 unwritten 10 476 13542927 13542766 47 unwritten 11 523 13543448 13542974 47 unwritten 12 570 13543595 13543495 47 unwritten 13 617 13543745 13543642 47 unwritten 14 664 13543994 13543792 47 unwritten 15 711 13544115 13544041 47 unwritten 16 758 13544396 13544162 47 unwritten 17 805 13544471 13544443 47 unwritten 18 852 13544608 13544518 47 unwritten 19 899 13547571 13544655 48 unwritten 20 947 13545648 13547619 47 unwritten 21 994 13545706 13545695 47 unwritten 22 1041 13544043 13545753 46 unwritten 23 1087 13547656 13544089 88 unwritten 24 1175 13544923 13547744 46 unwritten 25 1221 13547756 13544969 47 unwritten 26 1268 13545598 13547803 46 unwritten 27 1314 13546485 13545644 46 unwritten 28 1360 13546677 13546531 46 unwritten 29 1406 13547836 13546723 83 unwritten 30 1489 13547921 13547919 51 unwritten 31 1540 13547973 13547972 55 unwritten 32 1595 13546828 13548028 46 unwritten 33 1641 13548107 13546874 68 unwritten 34 1709 13548176 13548175 59 unwritten 35 1768 13546883 13548235 46 unwritten 36 1814 13542536 13546929 45 unwritten 37 1859 13546182 13542581 44 unwritten 38 1903 13548255 13546226 52 unwritten 39 1955 13541526 13548307 43 unwritten 40 1998 13545077 13541569 43 unwritten 41 2041 13545183 13545120 43 unwritten 42 2084 13541687 13545226 42 unwritten 43 2126 13543819 13541729 42 unwritten 44 2168 13548400 13543861 132 unwritten 45 2300 13548605 13548532 73 unwritten 46 2373 13548679 13548678 43 unwritten 47 2416 13545815 13548722 42 unwritten 48 2458 13548728 13545857 104 unwritten 49 2562 13548833 13548832 62 unwritten 50 2624 13548896 13548895 45 unwritten 51 2669 13548942 13548941 66 unwritten 52 2735 13546442 13549008 40 unwritten 53 2775 13542342 13546482 38 unwritten 54 2813 13544286 13542380 38 unwritten 55 2851 13549069 13544324 152 unwritten 56 3003 13541775 13549221 37 unwritten 57 3040 13545858 13541812 37 unwritten 58 3077 13549016 13545895 37 unwritten 59 3114 13544780 13549053 36 unwritten 60 3150 13547004 13544816 36 unwritten 61 3186 13546147 13547040 34 unwritten 62 3220 13549304 13546181 60 unwritten 63 3280 13549365 13549364 76 unwritten 64 3356 13548308 13549441 34 unwritten 65 3390 13542234 13548342 32 unwritten 66 3422 13548343 13542266 32 unwritten 67 3454 13542009 13548375 31 unwritten 68 3485 13542445 13542040 31 unwritten 69 3516 13542662 13542476 31 unwritten 70 3547 13545965 13542693 31 unwritten 71 3578 13549222 13545996 31 unwritten 72 3609 13543892 13549253 30 unwritten 73 3639 13544749 13543922 30 unwritten 74 3669 13545323 13544779 30 unwritten 75 3699 13546759 13545353 30 unwritten 76 3729 13546645 13546789 29 unwritten 77 3758 13547328 13546674 29 unwritten 78 3787 13544257 13547357 28 unwritten 79 3815 13549893 13544285 33 unwritten 80 3848 13550421 13549926 60 unwritten 81 3908 13554246 13550481 59 unwritten 82 3967 13550131 13554305 56 unwritten 83 4023 13551262 13550187 56 unwritten 84 4079 13551565 13551318 56 unwritten 85 4135 13551661 13551621 56 unwritten 86 4191 13553303 13551717 56 unwritten 87 4247 13555017 13553359 56 unwritten 88 4303 13550960 13555073 55 unwritten 89 4358 13554082 13551015 55 unwritten 90 4413 13554384 13554137 55 unwritten 91 4468 13554916 13554439 55 unwritten 92 4523 13551128 13554971 54 unwritten 93 4577 13552389 13551182 52 unwritten 94 4629 13555468 13552441 51 unwritten 95 4680 13554742 13555519 50 unwritten 96 4730 13555208 13554792 50 unwritten 97 4780 13554673 13555258 49 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unwritten 123 6221 13555841 13552681 38 unwritten 124 6259 13555681 13555879 37 unwritten 125 6296 13551425 13555718 36 unwritten 126 6332 13550385 13551461 35 unwritten 127 6367 13552288 13550420 35 unwritten 128 6402 13552457 13552323 35 unwritten 129 6437 13555329 13552492 35 unwritten 130 6472 13550340 13555364 33 unwritten 131 6505 13550901 13550373 33 unwritten 132 6538 13552164 13550934 33 unwritten 133 6571 13551528 13552197 32 unwritten 134 6603 13551622 13551560 31 unwritten 135 6634 13557026 13551653 31 unwritten 136 6665 13552696 13557057 29 unwritten 137 6694 13549661 13552725 26 unwritten 138 6720 13552070 13549687 26 unwritten 139 6746 13557336 13552096 26 unwritten 140 6772 13549741 13557362 24 unwritten 141 6796 13551016 13549765 24 unwritten 142 6820 13551805 13551040 24 unwritten 143 6844 13551878 13551829 24 unwritten 144 6868 13553981 13551902 24 unwritten 145 6892 13554972 13554005 24 unwritten 146 6916 13556993 13554996 23 unwritten 147 6939 13554631 13557016 22 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unwritten 173 7380 13554362 13551963 13 unwritten 174 7393 13557585 13554375 13 unwritten 175 7406 13550091 13557598 12 unwritten 176 7418 13550248 13550103 12 unwritten 177 7430 13551484 13550260 12 unwritten 178 7442 13551981 13551496 12 unwritten 179 7454 13552582 13551993 12 unwritten 180 7466 13554799 13552594 12 unwritten 181 7478 13554997 13554811 12 unwritten 182 7490 13555452 13555009 12 unwritten 183 7502 13556098 13555464 12 unwritten 184 7514 13557363 13556110 12 unwritten 185 7526 13550750 13557375 11 unwritten 186 7537 13550762 13550761 11 unwritten 187 7548 13551903 13550773 11 unwritten 188 7559 13554730 13551914 11 unwritten 189 7570 13550691 13554741 10 unwritten 190 7580 13551517 13550701 10 unwritten 191 7590 13552324 13551527 10 unwritten 192 7600 13554013 13552334 10 unwritten 193 7610 13554812 13554023 10 unwritten 194 7620 13549843 13554822 9 unwritten 195 7629 13551118 13549852 9 unwritten 196 7638 13551250 13551127 9 unwritten 197 7647 13551500 13551259 9 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13558749 13558683 4 unwritten 224 7817 13559165 13558753 4 unwritten 225 7821 13564189 13559169 36 unwritten 226 7857 13564289 13564225 70 unwritten 227 7927 13559354 13564359 4 unwritten 228 7931 13564891 13559358 38 unwritten 229 7969 13565148 13564929 84 unwritten 230 8053 13565233 13565232 63 unwritten 231 8116 13565297 13565296 19 unwritten 232 8135 13565317 13565316 10 unwritten 233 8145 13565328 13565327 41 unwritten 234 8186 13559471 13565369 4 unwritten 235 8190 13565375 13559475 45 unwritten 236 8235 13565421 13565420 38 unwritten 237 8273 13565460 13565459 48 unwritten 238 8321 13565509 13565508 17 unwritten 239 8338 13565370 13565526 4 unwritten 240 8342 13557962 13565374 3 unwritten 241 8345 13565533 13557965 94 unwritten 242 8439 13558370 13565627 3 unwritten 243 8442 13565631 13558373 6 unwritten 244 8448 13565638 13565637 86 unwritten 245 8534 13558540 13565724 3 unwritten 246 8537 13565729 13558543 13 unwritten 247 8550 13565743 13565742 105 unwritten 248 8655 13565849 13565848 28 unwritten 249 8683 13565878 13565877 75 unwritten 250 8758 13558664 13565953 3 unwritten 251 8761 13558762 13558667 3 unwritten 252 8764 13558858 13558765 3 unwritten 253 8767 13565981 13558861 11 unwritten 254 8778 13570409 13565992 54 unwritten 255 8832 13571201 13570463 47 unwritten 256 8879 13575188 13571248 35 unwritten 257 8914 13579393 13575223 119 unwritten 258 9033 13582040 13579512 106 unwritten 259 9139 13582147 13582146 82 unwritten 260 9221 13582231 13582229 106 unwritten 261 9327 13575840 13582337 53 unwritten 262 9380 13582005 13575893 34 unwritten 263 9414 13579728 13582039 33 unwritten 264 9447 13579915 13579761 24 unwritten 265 9471 13574339 13579939 23 unwritten 266 9494 13577088 13574362 20 unwritten 267 9514 13577627 13577108 19 unwritten 268 9533 13579950 13577646 18 unwritten 269 9551 13574295 13579968 17 unwritten 270 9568 13582508 13574312 30 unwritten 271 9598 13588652 13582538 146 unwritten 272 9744 13585801 13588798 121 unwritten 273 9865 13585434 13585922 120 unwritten 274 9985 13588448 13585554 119 unwritten 275 10104 13588180 13588567 113 unwritten 276 10217 13588951 13588293 107 unwritten 277 10324 13586207 13589058 106 unwritten 278 10430 13589131 13586313 164 unwritten 279 10594 13586622 13589295 102 unwritten 280 10696 13589328 13586724 106 unwritten 281 10802 13586927 13589434 82 unwritten 282 10884 13585993 13587009 79 unwritten 283 10963 13587311 13586072 78 unwritten 284 11041 13589514 13587389 78 unwritten 285 11119 13587602 13589592 77 unwritten 286 11196 13589929 13587679 161 unwritten 287 11357 13589436 13590090 77 unwritten 288 11434 13590120 13589513 120 unwritten 289 11554 13590241 13590240 126 unwritten 290 11680 13586543 13590367 76 unwritten 291 11756 13590409 13586619 120 unwritten 292 11876 13589593 13590529 70 unwritten 293 11946 13586857 13589663 69 unwritten 294 12015 13586359 13586926 67 unwritten 295 12082 13588883 13586426 67 unwritten 296 12149 13589063 13588950 67 unwritten 297 12216 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44778807 95 unwritten 322 13686 44778858 44781320 44 unwritten 323 13730 44778187 44778902 43 unwritten 324 13773 44779053 44778230 41 unwritten 325 13814 44781399 44779094 43 unwritten 326 13857 44778962 44781442 40 unwritten 327 13897 44779487 44779002 40 unwritten 328 13937 44778414 44779527 39 unwritten 329 13976 44778922 44778453 39 unwritten 330 14015 44781321 44778961 39 unwritten 331 14054 44781517 44781360 85 unwritten 332 14139 44780786 44781602 38 unwritten 333 14177 44777555 44780824 37 unwritten 334 14214 44780587 44777592 36 unwritten 335 14250 44778642 44780623 35 unwritten 336 14285 44781647 44778677 100 unwritten 337 14385 44781748 44781747 45 unwritten 338 14430 44780382 44781793 35 unwritten 339 14465 44778340 44780417 34 unwritten 340 14499 44779385 44778374 34 unwritten 341 14533 44781848 44779419 72 unwritten 342 14605 44779870 44781920 34 unwritten 343 14639 44780015 44779904 34 unwritten 344 14673 44777889 44780049 33 unwritten 345 14706 44781972 44777922 138 unwritten 346 14844 44782111 44782110 160 unwritten 347 15004 44780926 44782271 32 unwritten 348 15036 44778375 44780958 31 unwritten 349 15067 44778575 44778406 31 unwritten 350 15098 44780187 44778606 30 unwritten 351 15128 44782299 44780217 37 unwritten 352 15165 44778688 44782336 29 unwritten 353 15194 44782353 44778717 75 unwritten 354 15269 44782429 44782428 122 unwritten 355 15391 44782553 44782551 322 unwritten 356 15713 44782876 44782875 40 unwritten 357 15753 44782917 44782916 30 unwritten 358 15783 44782948 44782947 70 unwritten 359 15853 44783019 44783018 86 unwritten 360 15939 44783107 44783105 215 unwritten 361 16154 44783323 44783322 35 unwritten 362 16189 44778724 44783358 29 unwritten 363 16218 44783389 44778753 52 unwritten 364 16270 44783442 44783441 67 unwritten 365 16337 44783510 44783509 76 unwritten 366 16413 44783587 44783586 91 unwritten 367 16504 44783679 44783678 188 unwritten 368 16692 44783868 44783867 55 unwritten 369 16747 44783924 44783923 45 unwritten 370 16792 44783970 44783969 39 unwritten 371 16831 44780072 44784009 29 unwritten 372 16860 44784022 44780101 73 unwritten 373 16933 44784096 44784095 76 unwritten 374 17009 44780115 44784172 29 unwritten 375 17038 44780145 44780144 29 unwritten 376 17067 44784181 44780174 233 unwritten 377 17300 44784415 44784414 255 unwritten 378 17555 44783359 44784670 29 unwritten 379 17584 44779712 44783388 28 unwritten 380 17612 44779777 44779740 28 unwritten 381 17640 44784707 44779805 52 unwritten 382 17692 44781369 44784759 28 unwritten 383 17720 44777970 44781397 27 unwritten 384 17747 44778085 44777997 27 unwritten 385 17774 44778141 44778112 27 unwritten 386 17801 44778293 44778168 27 unwritten 387 17828 44784809 44778320 179 unwritten 388 18007 44784989 44784988 40 unwritten 389 18047 44785030 44785029 231 unwritten 390 18278 44785262 44785261 45 unwritten 391 18323 44785308 44785307 357 unwritten 392 18680 44778547 44785665 27 unwritten 393 18707 44779357 44778574 27 unwritten 394 18734 44779537 44779384 27 unwritten 395 18761 44780278 44779564 27 unwritten 396 18788 44781921 44780305 27 unwritten 397 18815 44779017 44781948 26 unwritten 398 18841 44779580 44779043 26 unwritten 399 18867 44780335 44779606 26 unwritten 400 18893 44780658 44780361 26 unwritten 401 18919 44780728 44780684 26 unwritten 402 18945 44785892 44780754 30 unwritten 403 18975 44789606 44785922 136 unwritten 404 19111 44788602 44789742 104 unwritten 405 19215 44789075 44788706 95 unwritten 406 19310 44789895 44789170 92 unwritten 407 19402 44787855 44789987 78 unwritten 408 19480 44787670 44787933 77 unwritten 409 19557 44791413 44787747 80 unwritten 410 19637 44788513 44791493 75 unwritten 411 19712 44790631 44788588 75 unwritten 412 19787 44787177 44790706 71 unwritten 413 19858 44791556 44787248 122 unwritten 414 19980 44790092 44791678 69 unwritten 415 20049 44786455 44790161 68 unwritten 416 20117 44790242 44786523 66 unwritten 417 20183 44791726 44790308 118 unwritten 418 20301 44791100 44791844 63 unwritten 419 20364 44788380 44791163 62 unwritten 420 20426 44786252 44788442 54 unwritten,eof testfile: 421 extents found -- Bron Gondwana brong@...tmail.fm -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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