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    SubjectRe: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs
    From
    Date
    Andrew Morton <akpm@osdl.org> writes:

    > Could you generate a kernel profile? Add `profile=1' to the kernel boot
    > command line and run:
    >
    > sudo readprofile -r
    > sudo readprofile -M10
    > time make -j4
    > readprofile -n -v -m /boot/System.map | sort -n +2 | tail -40 | tee ~/profile.txt >&2
    >
    > on both 2.4 and 2.6? Make sure the System.map is appropriate to the
    > currently-running kernel.

    2.4.24

    239.24user 85.80system 2:50.73elapsed 190%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (1741932major+1948496minor)pagefaults 0swaps

    c013bcd8 fput 366 1.5000
    c017c154 search_by_key 377 0.1010
    c01242dc sys_rt_sigprocmask 399 0.6786
    c022b388 strnlen_user 427 4.8523
    c013210c kmem_cache_alloc 431 1.3814
    c0134968 __alloc_pages 445 0.6825
    c012d628 filemap_nopage 449 0.8909
    c0133168 delta_nr_inactive_pages 452 5.6500
    c0114478 flush_tlb_page 533 4.5948
    c012c76c do_generic_file_read 536 0.4573
    c012c18c unlock_page 608 5.8462
    c013300c lru_cache_add 609 5.2500
    c0135fa4 get_swaparea_info 622 1.0436
    c012b514 set_page_dirty 630 4.0385
    c0129b3c handle_mm_fault 655 3.5598
    c0117a68 schedule 678 0.5168
    c0119444 mm_init 695 3.4750
    c01195dc copy_mm 705 0.9375
    c0119d60 do_fork 822 0.4061
    c012a894 find_vma 822 9.7857
    c01089b0 system_call 865 15.4464
    c0135094 free_page_and_swap_cache 899 17.2885
    c0145050 link_path_walk 977 0.3972
    c01284a0 __free_pte 1016 14.1111
    c012c2d8 __find_get_page 1032 16.1250
    c0128500 clear_page_tables 1112 4.9643
    c014e514 d_lookup 1131 3.9824
    c011de3c exit_notify 1216 1.7471
    c0134290 __free_pages_ok 1357 1.9956
    c012ce8c file_read_actor 1515 10.8214
    c0134538 rmqueue 2011 3.3970
    c0134c7c __free_pages 2122 66.3125
    c012999c do_no_page 2849 6.8486
    c0116a3c do_page_fault 3996 3.3922
    c01285e0 copy_page_range 4671 10.4263
    c01287a0 zap_page_range 5395 6.1029
    c01298bc do_anonymous_page 6867 30.6562
    c0129364 do_wp_page 20003 37.8845
    c0106d60 default_idle 66782 1284.2692
    00000000 total 154891 0.1278


    2.6.1

    248.82user 122.01system 3:37.24elapsed 170%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (474major+3768844minor)pagefaults 0swaps

    c011e450 mm_init 441 1.8375
    c0114658 sched_clock 452 3.7667
    c0108ac8 copy_thread 462 0.8431
    c010a79c syscall_call 471 42.8182
    c010b1e0 error_code 477 8.5179
    c0127a1c del_timer_sync 492 3.7273
    c01229e0 wait_task_zombie 535 1.1239
    c0121970 put_files_struct 556 2.8958
    c010c570 handle_IRQ_event 621 7.0568
    c011fbe0 do_fork 642 1.6895
    c0128d18 flush_signal_handlers 661 9.7206
    c0123ec0 do_softirq 675 3.3088
    c011add4 wake_up_forked_process 721 1.7672
    c0110d1c old_mmap 866 2.6728
    c0122d78 sys_wait4 889 1.5223
    c012c638 sys_rt_sigaction 905 3.7090
    c01168b8 flush_tlb_mm 1020 6.8919
    c012b0a4 get_signal_to_deliver 1374 1.4494
    c0123e38 current_kernel_time 1555 22.8676
    c011afc8 schedule_tail 1636 9.0889
    c01223e8 do_exit 1719 1.7613
    c011df4f .text.lock.sched 2228 7.7093
    c012b560 sys_rt_sigprocmask 2439 7.0901
    c012c0a0 do_sigaction 2709 4.0074
    c011e3c8 dup_task_struct 3056 22.4706
    c011de6c __preempt_spin_lock 3096 38.7000
    c011ec08 copy_files 3133 3.5602
    c012b474 sigprocmask 3433 14.5466
    c011c2e0 __wake_up 3495 45.9868
    c0121d58 exit_notify 3945 2.3482
    c0121150 release_task 4053 7.3960
    c011bbf0 schedule 6904 4.3150
    c011694c flush_tlb_page 7057 44.1063
    c011e6d4 copy_mm 7931 7.6851
    c010a770 system_call 8361 190.0227
    c011efe0 copy_process 8654 2.8171
    c0119588 pte_alloc_one 15888 248.2500
    c01199b8 do_page_fault 44374 37.2265
    c01086b0 default_idle 739276 14216.8462
    00000000 total 896883 5.5028
    --
    Philip Martin
    -
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