My MythTV box recently started showing odd behavior during recordings, at certain times the load of the box would spike to 10+ and recordings would start losing frames and become unwatchable. TOP would show mythbackend as using 90+% SYS CPU usage, which under normal circumstances it normally uses about 5% USR.
So I finally got around to profiling mythbackend when the load starts to spike. To my surprise it appears that once I have less then 10% (30GB) free on the drive reiserfs can't up, even just writing at 1mb/sec is too much for it. Is there something that can be done to fix this, 30gb seems like a lot of wasted space. #opreport CPU: CPU with timer interrupt, speed 0 MHz (estimated) Profiling through timer interrupt TIMER:0| samples| %| ------------------ 77863 78.7856 reiserfs 18183 18.3984 vmlinux 695 0.7032 mysqld 452 0.4574 libc-2.4.so 360 0.3643 libmythtv-0.19.so.0.19.0 324 0.3278 ivtv 323 0.3268 nvidia 242 0.2449 libqt-mt.so.3.3.6 110 0.1113 libpthread-2.4.so 53 0.0536 libstdc++.so.6.0.8 35 0.0354 ld-2.4.so 23 0.0233 libperl.so 22 0.0223 libz.so.1.2.3 <snip> #opreport -l /usr/src/linux/vmlinux CPU: CPU with timer interrupt, speed 0 MHz (estimated) Profiling through timer interrupt samples % symbol name 9607 52.8351 default_idle 7694 42.3142 find_next_zero_bit 183 1.0064 __copy_from_user_ll 57 0.3135 handle_IRQ_event 37 0.2035 __copy_to_user_ll 34 0.1870 ide_outb 30 0.1650 ide_end_request 22 0.1210 ioread8 22 0.1210 schedule 21 0.1155 get_page_from_freelist 17 0.0935 mmx_clear_page <snip> System Details: ----------------------------------------------- Kernel v2.6.16.21 (custom compiled) - This issue also happened with 2.6.14 too though. Filesystem Size Used Avail Use% Mounted on /dev/hda1 280G 269G 12G 97% / [EMAIL PROTECTED] cat /proc/mounts rootfs / rootfs rw 0 0 /dev /dev tmpfs rw 0 0 /dev/root / reiserfs rw,noatime,nodiratime 0 0 [EMAIL PROTECTED] cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 6 model : 6 model name : AMD Athlon(tm) XP 2100+ stepping : 2 cpu MHz : 1759.680 cache size : 256 KB [EMAIL PROTECTED] free total used free shared buffers cached Mem: 515992 496256 19736 0 36256 271728 -/+ buffers/cache: 188272 327720 Swap: 262136 408 261728 [EMAIL PROTECTED] ~]# hdparm -i /dev/hda /dev/hda: Model=ST3300622A, FwRev=3.AND, SerialNo=3NF1GAGW Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4 BuffType=unknown, BuffSize=16384kB, MaxMultSect=16, MultSect=16 CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=268435455 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 AdvancedPM=no WriteCache=enabled Drive conforms to: Unspecified: ATA/ATAPI-1 ATA/ATAPI-2 ATA/ATAPI-3 ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6 ATA/ATAPI-7 * signifies the current active mode [EMAIL PROTECTED] ~]# hdparm -tT /dev/hda /dev/hda: Timing cached reads: 1296 MB in 2.00 seconds = 646.99 MB/sec Timing buffered disk reads: 166 MB in 3.02 seconds = 55.05 MB/sec vmstat 1 output: -------------------------------------------------------------- procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 8 0 408 5800 29308 248604 0 0 0 1036 406 132 2 98 0 0 4 0 408 5644 29396 248608 0 0 0 1128 437 184 2 92 0 6 7 0 408 6316 29428 248020 0 0 0 1316 539 287 0 86 0 14 5 0 408 6104 29480 248180 0 0 0 588 415 187 0 99 0 1 4 0 408 5764 29536 248364 0 0 0 1092 421 172 2 97 1 0 6 0 408 6528 29592 247684 0 0 0 1092 425 161 2 98 0 1 2 1 408 6372 29676 247724 0 0 0 2304 385 170 2 97 1 0 5 0 408 6400 29676 247616 0 0 0 48 383 122 0 100 0 0 7 0 408 6192 29704 247872 0 0 0 1080 409 162 1 98 0 1 6 0 408 5720 29732 248304 0 0 0 1076 414 178 1 98 0 1 7 0 408 6348 29800 247552 0 0 0 1656 460 300 2 87 1 11 5 0 408 6628 29848 247248 0 0 0 1164 407 207 1 94 0 5 5 0 408 5884 29896 247996 0 0 4 1116 453 353 1 76 0 23 6 0 408 5640 29868 248204 0 0 0 1052 416 132 1 99 0 0 4 0 408 5772 29940 248104 0 0 0 648 490 314 1 84 1 14 6 1 408 6328 30036 247464 0 0 0 1928 488 305 2 85 0 13 4 0 408 6184 30076 247472 0 0 4 860 404 201 1 94 0 5 4 0 408 6332 30044 247328 0 0 0 1312 429 156 1 99 0 0 9 0 408 6120 30100 247580 0 0 0 604 494 305 3 81 1 16 2 1 408 6460 30140 247116 0 0 0 1372 436 315 1 79 0 20 10 0 408 6252 30176 247372 0 0 0 456 412 126 1 99 0 0 6 0 408 6432 30164 247276 0 0 4 1268 425 255 1 88 1 10 3 0 408 5688 30220 247948 0 0 0 1332 454 352 0 78 0 22 2 1 408 6352 30284 247124 0 0 0 1140 362 156 2 96 1 1 5 0 408 6564 30284 246908 0 0 0 92 472 316 2 83 0 15 5 0 408 6348 30352 247056 0 0 0 1168 506 350 0 83 0 17 4 0 408 5604 30404 247828 0 0 4 1124 448 262 2 87 0 11 3 0 408 5880 30444 247500 0 0 0 1104 426 315 2 77 1 20 2 1 408 5916 30496 247352 0 0 0 1064 365 152 1 97 0 2 7 0 408 6072 30496 247204 0 0 0 440 489 307 1 82 0 17 6 0 408 5936 30528 247288 0 0 0 816 434 130 2 98 0 0 4 0 408 5944 30588 247300 0 0 0 1108 359 172 0 98 0 2 4 0 408 5664 30624 247508 0 0 0 1444 426 161 0 99 1 0 5 0 408 6656 30608 246572 0 0 0 1220 425 163 2 98 0 1 6 0 408 6316 30656 246848 0 0 0 1552 441 180 1 98 0 1 4 0 408 6408 30632 246776 0 0 0 644 403 140 1 99 0 0 9 0 408 6072 30696 247060 0 0 4 744 496 351 2 82 1 16 5 0 408 5864 30708 247240 0 0 0 1680 509 335 1 83 1 15 procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 3 1 408 6284 30768 246768 0 0 0 1132 434 328 1 76 1 22 6 0 408 6352 30772 246692 0 0 0 576 373 170 0 93 0 7 4 0 408 6008 30820 246932 0 0 4 612 496 322 1 83 0 16 4 0 408 6288 30836 246600 0 0 0 1484 480 304 1 85 0 14 4 0 408 6064 30896 246844 0 0 0 1136 504 337 1 84 1 15 5 0 408 5728 30900 247116 0 0 4 1188 426 156 1 99 0 0 6 0 408 5696 30968 247144 0 0 0 1104 367 123 3 97 0 0 4 0 408 5608 31016 247144 0 0 0 1152 445 378 2 74 1 23 7 0 408 5576 31008 247088 0 0 0 964 402 115 1 99 0 0 4 0 408 6328 31052 246396 0 0 0 628 355 152 1 98 0 1 5 0 408 6116 31112 246524 0 0 0 1620 472 299 2 85 1 12 2 1 408 6336 31204 246176 0 0 0 1112 367 156 2 96 0 2 7 0 408 6388 31176 246192 0 0 0 76 457 272 0 86 0 14 5 0 408 6268 31232 246284 0 0 0 1136 466 267 1 85 1 13 2 1 408 5932 31304 246616 0 0 4 2068 374 173 1 99 0 0 6 0 408 5960 31224 246564 0 0 0 104 472 273 1 84 0 15 6 0 408 5692 31308 246716 0 0 0 1160 412 206 2 94 0 4 5 0 408 5600 31336 246892 0 0 4 1660 480 289 2 86 0 12 7 0 408 6400 31336 245964 0 0 0 1052 418 160 3 97 0 0 6 0 408 6316 31292 246136 0 0 0 512 432 127 1 99 0 0 5 0 408 5856 31372 246528 0 0 0 1824 404 159 2 96 0 2 3 0 408 5880 31424 246412 0 0 0 1156 454 174 1 97 1 1 3 0 408 6024 31372 246336 0 0 0 896 399 130 0 100 0 0 5 0 408 5812 31432 246492 0 0 0 708 413 160 1 97 0 2 5 0 408 6396 31424 246024 0 0 0 1604 436 163 1 97 1 1 6 1 408 6276 31492 245924 0 0 216 1176 511 409 3 82 0 15 4 0 408 6312 31528 245944 0 0 0 1116 468 263 1 86 0 13 1 2 408 6592 31576 245628 0 0 56 1044 343 126 0 97 0 3 5 0 408 6312 31576 245904 0 0 32 48 427 155 0 97 0 3 1 0 408 5816 31624 246360 0 0 72 1796 590 834 2 40 35 24 1 1 408 16872 31704 247564 0 0 1232 248 513 1185 28 4 11 57 1 1 408 31240 31768 248520 0 0 932 92 403 996 32 4 10 54 1 0 408 29576 31880 248704 0 0 188 248 372 997 7 6 61 26 1 1 408 28284 31952 249852 0 0 316 344 402 842 20 21 45 13 0 1 408 27188 32008 250940 0 0 112 976 393 465 33 58 0 9 5 1 408 24748 32100 253228 0 0 1212 1424 571 949 31 31 0 37 2 0 408 23052 32156 255032 0 0 544 1036 415 351 16 80 0 4 0 1 408 21148 32232 256808 0 0 516 1480 454 692 33 41 0 25 procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 2 1 408 19616 32288 258308 0 0 576 1352 414 478 33 59 0 8 4 0 408 18084 32348 259816 0 0 496 1344 423 524 29 56 0 15 5 0 408 17016 32428 260844 0 0 192 812 518 574 24 63 0 13 2 0 408 15348 32488 262444 0 0 208 1064 416 295 14 85 0 1 5 0 408 13616 32552 264104 0 0 84 1684 497 615 32 66 0 2 5 1 408 13496 32612 263992 0 0 92 1148 530 526 14 71 0 14 0 1 408 13000 32784 264556 0 0 80 1240 506 504 1 59 0 40 3 1 408 12132 32864 265324 0 0 36 612 431 438 2 65 0 34 1 1 408 10196 33048 266960 0 0 216 4 440 565 1 60 0 39 1 1 408 9252 33284 267768 0 0 168 2444 463 617 1 56 0 43 0 3 408 7208 33376 269680 0 0 32 3460 459 497 1 59 0 40 2 1 408 6416 33444 270392 0 0 24 748 448 423 0 71 0 29 0 1 408 5976 33664 270568 0 0 220 1436 481 654 2 55 0 43 1 0 408 6100 33700 270356 0 0 8 844 406 389 9 70 16 5 0 0 408 5848 33732 270568 0 0 0 1128 435 401 0 72 27 1 1 0 408 5720 33772 270664 0 0 0 852 398 350 1 73 25 1 1 0 408 6100 33780 270320 0 0 0 1216 446 522 0 54 45 1 3 0 408 5736 33780 270644 0 0 0 1092 475 736 0 32 67 1 1 0 408 6372 33952 269720 0 0 0 1040 462 522 4 69 26 1 2 0 408 6436 33944 269592 0 0 0 864 433 287 0 83 16 1 0 0 408 5848 34024 270140 0 0 4 1232 480 701 3 39 53 5 2 0 408 9196 33936 266612 0 0 104 212 596 1035 10 43 40 8 3 0 408 8824 33936 267380 0 0 0 512 388 90 0 100 0 0 4 0 408 7956 33968 268148 0 0 0 548 400 114 1 98 0 1 2 0 408 6492 34000 269604 0 0 0 892 432 629 0 38 61 1 2 0 408 6416 34084 269648 0 0 0 1712 403 591 0 40 58 2 5 0 408 6612 34120 269376 0 0 0 844 447 557 1 49 49 1 4 0 408 6424 34148 269548 0 0 0 880 465 493 0 65 35 0 1 0 408 6336 34196 269596 0 0 0 1112 475 552 3 59 36 2 4 1 408 6304 34340 269404 0 0 0 1668 378 316 0 78 22 0 3 0 408 6096 34368 269608 0 0 0 308 411 625 1 38 59 2 3 0 408 6268 34412 269372 0 0 0 1148 398 583 0 39 60 1 5 0 408 6400 34444 269264 0 0 0 824 431 414 0 67 33 0 -- Mike Benoit <[EMAIL PROTECTED]>
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