On Fri, 2006-07-07 at 19:49 +0200, Jan Kara wrote:
> Hi,
>
> just one note: I've looked to the in scan_bitmap() in bitmap.c. There is:
> /* When the bitmap is more than 10% free, anyone can allocate.
> * When it's less than 10% free, only files that already use the
> * bitmap are allowed. Once we pass 80% full, this restriction
> * is lifted.
> *
> * We do this so that files that grow later still have space
> * close to
> * their original allocation. This improves locality, and
> * presumably
> * performance as a result.
> *
> * This is only an allocation policy and does not make up for
> * getting a
> * bad hint. Decent hinting must be implemented for this to work
> * well.
> */
> if (TEST_OPTION(skip_busy, s)
> && SB_FREE_BLOCKS(s) > SB_BLOCK_COUNT(s) / 20) {
>
> So the comment suggests we should lift the restriction when we are 80%
> full but if you see the condition, it checks wherher we are 95% full! I
> guess that is really asking for trouble and could explain the
> behaviour...
> Mike could you try changing that 20 in the test to 5? IMHO that could
> fix your problem.It looks like it lasted a little longer, but probably not enough to determine that this change made the difference or not. /dev/hda1 293024652 271457512 21567140 93% / Attached is the vmstat output of the problem occurring. [EMAIL PROTECTED] tmp]# opreport -l /usr/src/linux/vmlinux | head -n20 CPU: CPU with timer interrupt, speed 0 MHz (estimated) Profiling through timer interrupt samples % symbol name 3945 53.9082 default_idle 3031 41.4184 find_next_zero_bit 50 0.6832 __copy_from_user_ll 30 0.4099 handle_IRQ_event 16 0.2186 ide_outb 16 0.2186 ioread8 10 0.1366 ide_end_request 10 0.1366 mmx_clear_page 10 0.1366 number 9 0.1230 __copy_to_user_ll 7 0.0957 get_page_from_freelist 5 0.0683 __find_get_block 5 0.0683 __link_path_walk 5 0.0683 kmem_cache_alloc 5 0.0683 mmx_copy_page 5 0.0683 sysenter_past_esp 4 0.0547 __make_request -- Mike Benoit <[EMAIL PROTECTED]>
Fri Jul 7 13:48:49 PDT 2006 Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 293024652 271457512 21567140 93% / procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 572 6416 13472 108712 0 0 836 2086 520 966 57 3 31 9 0 0 572 6112 13444 108996 0 0 1 1830 461 468 0 5 60 35 0 0 572 6788 13404 108368 0 0 2 1916 477 484 1 7 61 31 0 0 572 5760 13424 109288 0 0 1 1884 461 470 0 5 58 37 0 0 572 6104 13536 108884 0 0 1 1950 462 462 0 10 55 34 0 1 572 6652 13468 108460 0 0 2 1901 478 483 1 9 57 34 Fri Jul 7 13:49:39 PDT 2006 Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 293024652 271546292 21478360 93% / procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 572 6636 13480 108492 0 0 831 2085 520 962 57 3 31 9 0 1 572 6012 13692 108912 0 0 8 1900 470 476 0 5 60 35 0 0 572 6148 13584 108792 0 0 1 1844 464 468 0 8 58 33 0 1 572 5740 13832 108980 0 0 2 1949 479 506 1 1 71 27 0 1 572 6140 13632 108712 0 0 1 1828 467 481 0 2 60 38 0 0 572 5984 13532 109072 0 0 2 2012 466 481 0 5 62 34 Fri Jul 7 13:50:29 PDT 2006 Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 293024652 271636228 21388424 93% / procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 2 572 6172 13576 108736 0 0 825 2084 520 959 56 3 31 9 3 1 572 6288 13664 108584 0 0 2 1844 484 481 1 9 56 34 3 0 572 6352 13548 108580 0 0 2 1568 435 372 0 32 46 21 6 0 572 6092 13808 108600 0 0 0 560 360 161 2 94 0 3 2 2 572 5648 13968 108812 0 0 2 626 399 149 1 88 2 9 6 1 572 6344 14096 108092 0 0 1 464 343 62 0 99 0 0 Fri Jul 7 13:51:20 PDT 2006 Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 293024652 271682836 21341816 93% / procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 7 0 572 6328 14096 108100 0 0 820 2077 519 954 56 3 31 9 3 0 572 5920 14352 108284 0 0 0 416 338 67 1 99 0 0 5 0 572 6160 14536 107800 0 0 0 476 366 90 1 95 0 4 7 1 572 6164 14784 107556 0 0 1 428 372 106 0 93 0 6 2 0 572 6284 14968 107232 0 0 1 541 377 121 1 92 0 7 5 0 572 5756 15124 107600 0 0 0 474 354 75 1 96 0 3 Fri Jul 7 13:52:12 PDT 2006 Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 293024652 271702980 21321672 93% / procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 5 0 572 5652 15124 107600 0 0 814 2066 518 949 56 4 31 9 4 0 572 5868 15096 107628 0 0 0 444 332 56 1 99 0 0 7 0 572 5608 15324 107632 0 0 0 462 338 68 1 98 0 1 5 1 572 5924 15408 107220 0 0 0 513 358 80 1 96 0 3 4 0 572 6368 15568 106676 0 0 1 432 364 94 1 94 0 5 7 1 572 6476 15816 106292 0 0 10 514 365 88 1 94 0 5 Fri Jul 7 13:53:02 PDT 2006 Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 293024652 271723752 21300900 93% / procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 6 1 572 6412 15816 106300 0 0 809 2056 517 943 55 5 31 9 4 0 572 6456 15968 106152 0 0 0 462 367 95 1 94 0 6 4 0 572 5956 15992 106500 0 0 0 544 349 78 1 97 0 3 5 1 572 6616 16116 105856 0 0 0 400 338 69 0 99 0 1 3 1 572 6456 16252 105868 0 0 0 495 353 88 1 94 0 5 4 0 572 5524 16460 106448 0 0 0 470 370 95 1 94 0 5 Fri Jul 7 13:53:53 PDT 2006 Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda1 293024652 271744908 21279744 93% / procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 3 1 572 6304 16432 105708 0 0 804 2045 515 937 55 5 31 9 5 0 572 5792 16596 106112 0 0 1 469 353 129 1 95 0 4 2 0 572 5592 16872 106028 0 0 1 492 382 112 1 89 0 10 4 1 572 6240 16864 105492 0 0 2 554 347 75 1 97 0 2 1 1 572 5588 17124 105744 0 0 0 462 350 70 0 98 0 1 4 0 572 5876 17228 105432 0 0 0 476 341 61 0 99 0 0
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