Re: [git patches] IDE update

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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
   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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