Re: [git patches] IDE update

Ondrej Zary
2005-07-05T13:58:18Z

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Jens Axboe wrote:
> On Tue, 2005-07-05 at 15:02 +0200, Ondrej Zary wrote:
>
>>>Ok, looks alright for both. Your machine is quite slow, perhaps that is
>>>showing the slower performance. Can you try and make HZ 100 in 2.6 and
>>>test again? 2.6.13-recent has it as a config option, otherwise edit
>>>include/asm/param.h appropriately.
>>>
>>
>>I forgot to write that my 2.6.12 kernel is already compiled with HZ 100
>>(it makes the system more responsive).
>>I've just tried 2.6.8.1 with HZ 1000 and there is no difference in HDD
>>performance comparing to 2.6.12.
>
>
> OK, interesting. You could try and boot with profile=2 and do
>
> # readprofile -r
> # dd if=/dev/hda of=/dev/null bs=128k
> # readprofile > prof_output
>
> for each kernel and post it here, so we can see if anything sticks out.
>
Here are the profiles (used dd with count=4096) from 2.4.26 and 2.6.12
(nothing from 2.6.8.1 because I don't have the .map file anymore).

--
Ondrej Zary

[-- Attachment #2: profile2426.txt --]
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448 default_idle 5.6000
4 __switch_to 0.0192
1 ret_from_sys_call 0.0588
3 handle_IRQ_event 0.0268
6 schedule 0.0072
8 __wake_up 0.0833
2 __constant_memcpy 0.0078
4 add_page_to_hash_queue 0.0625
2 __remove_inode_page 0.0156
6 add_to_page_cache_unique 0.0375
7 page_cache_read 0.0398
2 unlock_page 0.0179
7 generic_file_readahead 0.0168
11 do_generic_file_read 0.0101
1366 file_read_actor 8.5375
2 generic_file_read 0.0048
1 kmem_slab_destroy 0.0042
3 kmem_cache_grow 0.0057
2 kmem_cache_alloc 0.0625
28 kmem_cache_free 0.8750
2 kmem_cache_reap 0.0042
12 __kmem_cache_alloc 0.0536
4 lru_cache_add 0.0357
1 __lru_cache_del 0.0078
3 delta_nr_inactive_pages 0.0312
5 delta_nr_cache_pages 0.0521
17 shrink_cache 0.0180
1 refill_inactive 0.0031
16 __free_pages_ok 0.0200
20 rmqueue 0.0284
6 __alloc_pages 0.0091
1 __free_pages 0.0208
3 sys_read 0.0117
1 sys_write 0.0039
5 __remove_from_lru_list 0.0391
3 __remove_from_queues 0.0625
7 __put_unused_buffer_head 0.0729
3 get_unused_buffer_head 0.0234
24 set_bh_page 0.2143
32 create_buffers 0.1429
4 try_to_release_page 0.0500
4 create_empty_buffers 0.0417
24 block_read_full_page 0.0375
27 try_to_free_buffers 0.1055
10 max_block 0.0694
9 blkdev_get_block 0.1406
2 blkdev_direct_IO 0.0417
1 blkdev_readpage 0.0312
2 init_buffer_head 0.0312
25 __constant_c_and_count_memset 0.1736
2 write_profile 0.0417
114 __make_request 0.0642
27 generic_make_request 0.0844
25 submit_bh 0.0977
5 ide_inb 0.3125
7 ide_outb 0.4375
2 ide_outl 0.1250
1 ide_execute_command 0.0078
2 SELECT_DRIVE 0.0312
4 ide_start_request 0.0083
2 ide_do_request 0.0050
2 ide_get_queue 0.0312
4 ide_intr 0.0139
6 ide_dma_intr 0.0312
30 ide_build_sglist 0.0481
5 ide_build_dmatable 0.0120
1 __ide_dma_read 0.0042
1 __ide_dma_count 0.0312
3 __constant_c_and_count_memset 0.0208
67 idedisk_end_request 0.3490
2 __generic_copy_to_user 0.0312
0 *unknown*
2499 total 0.0013

[-- Attachment #3: profile2612.txt --]
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1 cpu_idle 0.0104
1 system_call 0.0200
1 __wake_up 0.0125
1 copy_mm 0.0011
1 profile_hit 0.0156
2 write_profile 0.0312
1 current_fs_time 0.0104
1 timespec_trunc 0.0156
1 __wake_up_bit 0.0208
5 handle_IRQ_event 0.0521
12 add_to_page_cache 0.0833
1 page_waitqueue 0.0156
2 __lock_page 0.0125
16 find_get_page 0.2500
7 do_generic_mapping_read 0.0049
8 file_read_actor 0.0312
2 __generic_file_aio_read 0.0038
1 generic_file_read 0.0052
9 mempool_alloc 0.0331
2 mempool_alloc_slab 0.1250
3 bad_range 0.0375
21 free_hot_cold_page 0.0772
22 buffered_rmqueue 0.0458
5 zone_watermark_ok 0.0284
5 __alloc_pages 0.0053
1 __read_page_state 0.0625
6 __mod_page_state 0.3750
1 get_dirty_limits 0.0048
4 test_clear_page_dirty 0.0179
2 read_pages 0.0074
11 __do_page_cache_readahead 0.0312
2 blockable_page_cache_readahead 0.0125
1 page_cache_readahead 0.0030
20 kmem_cache_alloc 0.4167
8 kmem_cache_free 0.1667
1 release_pages 0.0025
1 __pagevec_lru_add 0.0039
2 shrink_slab 0.0054
1 pageout 0.0037
43 shrink_list 0.0401
6 shrink_cache 0.0080
1 refill_inactive_zone 0.0009
2 balance_pgdat 0.0024
2 blk_queue_bounce 0.0312
1 unmap_vmas 0.0018
3 page_referenced 0.0234
1 rw_verify_area 0.0078
1 vfs_read 0.0045
1 vfs_write 0.0045
1 __clear_page_buffers 0.0156
5 alloc_page_buffers 0.0347
2 try_to_release_page 0.0312
12 create_empty_buffers 0.0833
14 block_read_full_page 0.0219
4 submit_bh 0.0147
7 drop_buffers 0.0486
7 try_to_free_buffers 0.0486
1 block_sync_page 0.0156
2 recalc_bh_state 0.0312
2 alloc_buffer_head 0.0250
1 free_buffer_head 0.0125
8 bio_alloc_bioset 0.0179
2 bio_put 0.0417
3 max_block 0.0268
2 blkdev_get_block 0.0312
2 blkdev_readpage 0.1250
2 update_atime 0.0114
1 __mark_inode_dirty 0.0024
2 mb_cache_shrink_fn 0.0043
1 radix_tree_preload 0.0063
998 __copy_to_user_ll 15.5938
1216 acpi_processor_idle 2.0033
9 blk_rq_map_sg 0.0256
3 get_request 0.0043
72 __make_request 0.0616
8 generic_make_request 0.0179
3 submit_bio 0.0170
61 ide_end_request 0.4236
1 start_request 0.0020
5 ide_do_request 0.0060
2 ide_intr 0.0052
2 ide_inb 0.1250
5 ide_outb 0.3125
1 ide_execute_command 0.0063
3 ide_build_sglist 0.0208
2 ide_build_dmatable 0.0066
1 ide_do_rw_disk 0.0089
8 schedule 0.0053
0 *unknown*
2734 total 0.0013