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

> Philip Martin <philip@codematters.co.uk> wrote:
>>
>> Andrew Morton <akpm@osdl.org> writes:
>>
>> > Could you generate a kernel profile? Add `profile=1' to the kernel boot
>> ...
>> 2.4.24
>
> OK.
>
>> 2.6.1
>
> Odd. Are you really sure that it was the correct System.map?

I'm reasonably confident that I am, but the 2.6 numbers still look
odd, I don't know why. So I've installed oprofile and used that to
profile instead; thus same problem different numbers.

As before I'm timing a software build (using make -j4) and it's slower
on 2.6 than 2.4 and it appears increased system CPU is the problem.
It's a dual P3 450MHz, 512MB ram, 2-disk aic7xxx SCSI RAID-0 and it's
not swapping. Typical timings are

kernel 2.4.24
239.24user 85.80system 2:50.73elapsed 190%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1741932major+1948496minor)pagefaults 0swaps

kernel 2.6.3-rc2
248.82user 122.01system 3:37.24elapsed 170%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (474major+3768844minor)pagefaults 0swaps

This is oprofile report for 2.4.24

CPU: PIII, speed 451.03 MHz (estimated)
Counted CPU_CLK_UNHALTED events (clocks processor is not halted) with a unit mask of 0x00 (No unit mask) count 100000
samples % app name symbol name
130946 8.7017 bash (no symbols)
89695 5.9604 vmlinux-2.4.24 do_wp_page
88996 5.9140 as (no symbols)
47436 3.1522 ld-2.2.5.so _dl_lookup_versioned_symbol
38161 2.5359 libbfd-2.14.90.0.7.so (no symbols)
35216 2.3402 cc1 yyparse
29175 1.9387 vmlinux-2.4.24 do_anonymous_page
24594 1.6343 vmlinux-2.4.24 zap_page_range
23044 1.5313 vmlinux-2.4.24 copy_page_range
22401 1.4886 libc-2.2.5.so memset
21343 1.4183 ld-2.2.5.so _dl_relocate_object
21111 1.4029 cc1 skip_block_comment
20104 1.3360 libc-2.2.5.so chunk_alloc
19883 1.3213 cc1 ht_lookup
17248 1.1462 cc1 _cpp_lex_direct
14680 0.9755 libc-2.2.5.so _IO_vfprintf
14158 0.9408 cc1 grokdeclarator
13853 0.9206 cc1 ggc_alloc
13838 0.9196 libc-2.2.5.so chunk_free
13433 0.8927 libc-2.2.5.so __malloc
13431 0.8925 ld-2.2.5.so strcmp
13259 0.8811 vmlinux-2.4.24 do_no_page
11993 0.7970 libc-2.2.5.so strncpy
11640 0.7735 libc-2.2.5.so strcmp
9912 0.6587 vmlinux-2.4.24 machine_check
9537 0.6338 vmlinux-2.4.24 nr_free_pages
9300 0.6180 cc1 parse_identifier
8977 0.5965 vmlinux-2.4.24 rmqueue
8935 0.5938 libc-2.2.5.so _IO_new_file_xsputn
8092 0.5377 libc-2.2.5.so memcpy
7824 0.5199 cc1 calc_hash
7496 0.4981 cc1 find_reloads
7144 0.4747 cc1 htab_find_slot_with_hash
6867 0.4563 vmlinux-2.4.24 file_read_actor
6670 0.4432 cc1 record_reg_classes
6597 0.4384 vmlinux-2.4.24 do_page_fault
6404 0.4256 libc-2.2.5.so strcpy
and this is 2.6.3-rc2

CPU: PIII, speed 451.163 MHz (estimated)
Counted CPU_CLK_UNHALTED events (clocks processor is not halted) with a unit mask of 0x00 (No unit mask) count 100000
samples % app name symbol name
137869 7.8626 bash (no symbols)
95232 5.4310 vmlinux-2.6.3-rc2 do_wp_page
89606 5.1102 as (no symbols)
62052 3.5388 vmlinux-2.6.3-rc2 default_idle
47196 2.6916 ld-2.2.5.so _dl_lookup_versioned_symbol
41176 2.3482 vmlinux-2.6.3-rc2 page_add_rmap
38747 2.2097 libbfd-2.14.90.0.7.so (no symbols)
35483 2.0236 cc1 yyparse
32590 1.8586 vmlinux-2.6.3-rc2 do_anonymous_page
32224 1.8377 vmlinux-2.6.3-rc2 copy_page_range
22685 1.2937 libc-2.2.5.so memset
21935 1.2509 vmlinux-2.6.3-rc2 __copy_to_user_ll
21475 1.2247 ld-2.2.5.so _dl_relocate_object
20979 1.1964 cc1 skip_block_comment
20938 1.1941 libc-2.2.5.so chunk_alloc
19628 1.1194 cc1 ht_lookup
17279 0.9854 vmlinux-2.6.3-rc2 page_remove_rmap
17140 0.9775 cc1 _cpp_lex_direct
16122 0.9194 vmlinux-2.6.3-rc2 do_no_page
14690 0.8378 libc-2.2.5.so _IO_vfprintf
14689 0.8377 libc-2.2.5.so chunk_free
14300 0.8155 cc1 grokdeclarator
14164 0.8078 libc-2.2.5.so __malloc
14001 0.7985 cc1 ggc_alloc
13678 0.7800 ld-2.2.5.so strcmp
12038 0.6865 libc-2.2.5.so strncpy
11770 0.6712 libc-2.2.5.so strcmp
10788 0.6152 vmlinux-2.6.3-rc2 mark_offset_tsc
10258 0.5850 vmlinux-2.6.3-rc2 page_fault
9848 0.5616 libc-2.2.5.so memcpy
9581 0.5464 cc1 parse_identifier
9210 0.5252 vmlinux-2.6.3-rc2 zap_pte_range
8994 0.5129 libc-2.2.5.so _IO_new_file_xsputn
8005 0.4565 cc1 calc_hash
7681 0.4380 cc1 find_reloads
7564 0.4314 vmlinux-2.6.3-rc2 pte_alloc_one
7446 0.4246 vmlinux-2.6.3-rc2 do_page_fault
extracting just the vmlinux bits I get this for 2.4.24

89695 5.9604 vmlinux-2.4.24 do_wp_page
29175 1.9387 vmlinux-2.4.24 do_anonymous_page
24594 1.6343 vmlinux-2.4.24 zap_page_range
23044 1.5313 vmlinux-2.4.24 copy_page_range
13259 0.8811 vmlinux-2.4.24 do_no_page
9912 0.6587 vmlinux-2.4.24 machine_check
9537 0.6338 vmlinux-2.4.24 nr_free_pages
8977 0.5965 vmlinux-2.4.24 rmqueue
6867 0.4563 vmlinux-2.4.24 file_read_actor
6597 0.4384 vmlinux-2.4.24 do_page_fault
6166 0.4097 vmlinux-2.4.24 default_idle
6001 0.3988 vmlinux-2.4.24 __free_pages_ok
5404 0.3591 vmlinux-2.4.24 find_trylock_page
5179 0.3442 vmlinux-2.4.24 lookup_swap_cache
4969 0.3302 vmlinux-2.4.24 exit_notify
4928 0.3275 vmlinux-2.4.24 clear_page_tables
4830 0.3210 vmlinux-2.4.24 d_lookup
3843 0.2554 vmlinux-2.4.24 link_path_walk
3714 0.2468 vmlinux-2.4.24 system_call
3549 0.2358 vmlinux-2.4.24 do_fork
3340 0.2220 vmlinux-2.4.24 copy_mm
3293 0.2188 vmlinux-2.4.24 find_vma_prev
3237 0.2151 vmlinux-2.4.24 schedule
3226 0.2144 vmlinux-2.4.24 do_generic_file_read
3198 0.2125 vmlinux-2.4.24 handle_mm_fault
3096 0.2057 vmlinux-2.4.24 mm_init
3067 0.2038 vmlinux-2.4.24 set_page_dirty
2727 0.1812 vmlinux-2.4.24 get_swaparea_info
2348 0.1560 vmlinux-2.4.24 flush_tlb_page
2143 0.1424 vmlinux-2.4.24 filemap_nopage
2083 0.1384 vmlinux-2.4.24 lru_cache_add
2051 0.1363 vmlinux-2.4.24 __free_pte
1923 0.1278 vmlinux-2.4.24 search_by_key
1777 0.1181 vmlinux-2.4.24 error_code
1735 0.1153 vmlinux-2.4.24 kmem_cache_alloc
1733 0.1152 vmlinux-2.4.24 do_generic_file_write
1702 0.1131 vmlinux-2.4.24 __get_user_2
1627 0.1081 vmlinux-2.4.24 __alloc_pages
1602 0.1065 vmlinux-2.4.24 sys_rt_sigprocmask
1546 0.1027 vmlinux-2.4.24 is_leaf

and this for 2.6.3-rc2

95232 5.4310 vmlinux-2.6.3-rc2 do_wp_page
62052 3.5388 vmlinux-2.6.3-rc2 default_idle
41176 2.3482 vmlinux-2.6.3-rc2 page_add_rmap
32590 1.8586 vmlinux-2.6.3-rc2 do_anonymous_page
32224 1.8377 vmlinux-2.6.3-rc2 copy_page_range
21935 1.2509 vmlinux-2.6.3-rc2 __copy_to_user_ll
17279 0.9854 vmlinux-2.6.3-rc2 page_remove_rmap
16122 0.9194 vmlinux-2.6.3-rc2 do_no_page
10788 0.6152 vmlinux-2.6.3-rc2 mark_offset_tsc
10258 0.5850 vmlinux-2.6.3-rc2 page_fault
9210 0.5252 vmlinux-2.6.3-rc2 zap_pte_range
7564 0.4314 vmlinux-2.6.3-rc2 pte_alloc_one
7446 0.4246 vmlinux-2.6.3-rc2 do_page_fault
6308 0.3597 vmlinux-2.6.3-rc2 handle_mm_fault
5878 0.3352 vmlinux-2.6.3-rc2 __d_lookup
5688 0.3244 vmlinux-2.6.3-rc2 release_pages
5181 0.2955 vmlinux-2.6.3-rc2 schedule
5021 0.2863 vmlinux-2.6.3-rc2 do_journal_end
4899 0.2794 vmlinux-2.6.3-rc2 find_vma
4576 0.2610 vmlinux-2.6.3-rc2 link_path_walk
4517 0.2576 vmlinux-2.6.3-rc2 buffered_rmqueue
4490 0.2561 vmlinux-2.6.3-rc2 find_get_page
3966 0.2262 vmlinux-2.6.3-rc2 search_by_key
3891 0.2219 vmlinux-2.6.3-rc2 system_call
3867 0.2205 vmlinux-2.6.3-rc2 is_leaf
3829 0.2184 vmlinux-2.6.3-rc2 copy_mm
3405 0.1942 vmlinux-2.6.3-rc2 flush_tlb_page
3405 0.1942 vmlinux-2.6.3-rc2 kmem_cache_alloc
3300 0.1882 vmlinux-2.6.3-rc2 scheduler_tick
3297 0.1880 vmlinux-2.6.3-rc2 __copy_from_user_ll
3286 0.1874 vmlinux-2.6.3-rc2 .text.lock.sched
3200 0.1825 vmlinux-2.6.3-rc2 copy_process
3194 0.1822 vmlinux-2.6.3-rc2 filemap_nopage
3081 0.1757 vmlinux-2.6.3-rc2 timer_interrupt
2779 0.1585 vmlinux-2.6.3-rc2 pte_alloc_map
2578 0.1470 vmlinux-2.6.3-rc2 radix_tree_lookup
2368 0.1350 vmlinux-2.6.3-rc2 unlock_page
2337 0.1333 vmlinux-2.6.3-rc2 __alloc_pages
2251 0.1284 vmlinux-2.6.3-rc2 restore_all
2187 0.1247 vmlinux-2.6.3-rc2 init_journal_hash

--
Philip Martin
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