Jens Axboe wrote:
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).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_outputfor each kernel and post it here, so we can see if anything sticks out.
-- Ondrej Zary
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
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
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