在 2009-02-02一的 09:58 -0600，Steven Pratt写道：

Finally cleared out a backlog of results to upload.  Main performance 
page is updated with all the links.  (http://btrfs.boxacle.net/)  Most 
recent results are on 2.6.29-rc2. As usual see analysis directory of 
results for oprofile, including call graphs.

Single disk results are not too bad.  Raid still falls apart on any 
write heavy workload.

Steve

Quick link to the latest single disk IO results:

http://btrfs.boxacle.net/repository/single-disk/2.6.29-rc2/2.6.29-rc2/2.6.29-rc2.html

Steve's fs performance tests shows performance regression on ext4 comparing with ext3 with O_DIRECT random writes,  about 10% on single disk.  

http://btrfs.boxacle.net/repository/single-disk/2.6.29-rc2/2.6.29-rc2/2.6.29-rc2_Large_file_random_writes_odirect._num_threads=32.html

And looked at the oprofile,  comparing with ext3,  ext4 seems  mark the
inode  diry quit often than ext3 does. 

62        0.0063  ext3.ko                  ext3_mark_iloc_dirty
367       0.0371  ext4.ko                  ext4_mark_iloc_dirty

This also seen in random read test (with no O_DIRECT) oprfofile data, so
it doesn't seem not a O_DIRECT issue.

Any thoughts?


More detail about the ext3/4 random odirect writes oprofile...


ext3:

:~/ext4$ grep ext3 oprofile-ext3-random-write-odirect.001 
554       0.0567  ext3.ko                  ext3_get_branch
346       0.0354  ext3.ko                  ext3_file_write
336       0.0344  ext3.ko                  ext3_direct_IO
215       0.0220  ext3.ko                  ext3_get_blocks_handle
125       0.0128  ext3.ko                  ext3_block_to_path
112       0.0115  ext3.ko                  verify_chain
76        0.0078  ext3.ko                  ext3_get_block
62        0.0063  ext3.ko                  ext3_mark_iloc_dirty
39        0.0040  ext3.ko                  __ext3_get_inode_loc
17        0.0017  ext3.ko                  ext3_getblk
14        0.0014  ext3.ko                  ext3_get_group_desc
13        0.0013  ext3.ko
__ext3_journal_get_write_access
13        0.0013  ext3.ko                  ext3_find_entry
13        0.0013  ext3.ko                  ext3_new_blocks
13        0.0013  ext3.ko                  ext3_reserve_inode_write
....

$ grep ext4 oprofile-ext4-random-write-odirect.001 
warning: could not check that the binary
file /lib/modules/2.6.29-rc2/kernel/fs/ext4/ext4.ko has not been
modified since the profile was taken. Results may be inaccurate.
420       0.0425  ext4.ko                  ext4_direct_IO
411       0.0416  ext4.ko                  ext4_file_write
403       0.0408  ext4.ko                  ext4_ext_find_extent
374       0.0378  ext4.ko                  __ext4_get_inode_loc
367       0.0371  ext4.ko                  ext4_mark_iloc_dirty
202       0.0204  ext4.ko                  ext4_ext_get_blocks
194       0.0196  ext4.ko                  ext4_get_blocks_wrap
179       0.0181  ext4.ko                  __ext4_ext_check_header
178       0.0180  ext4.ko                  ext4_journal_start_sb
117       0.0118  ext4.ko                  ext4_get_block
109       0.0110  ext4.ko                  ext4_get_group_desc
89        0.0090  ext4.ko                  ext4_mark_inode_dirty
84        0.0085  ext4.ko                  ext4_dirty_inode
74        0.0075  ext4.ko                  __ext4_journal_stop
.....

:~/ext4$ grep jbd2 oprofile-ext4-random-write-odirect.001 
450       0.0455  jbd2.ko                  start_this_handle
288       0.0291  jbd2.ko                  do_get_write_access
287       0.0290  jbd2.ko                  jbd2_journal_stop
244       0.0247  jbd2.ko                  jbd2_journal_start
235       0.0238  jbd2.ko                  jbd2_journal_dirty_metadata
214       0.0216  jbd2.ko                  jbd2_journal_add_journal_head


~/ext4$ grep jbd oprofile-ext3-random-write-odirect.001 
116       0.0119  jbd.ko                   journal_add_journal_head
94        0.0096  jbd.ko                   do_get_write_access
73        0.0075  jbd.ko                   start_this_handle
68        0.0070  jbd.ko                   journal_clean_one_cp_list
58        0.0059  jbd.ko                   journal_commit_transaction
48        0.0049  jbd.ko                   journal_dirty_metadata
45        0.0046  jbd.ko                   __journal_file_buffer
42        0.0043  jbd.ko                   __journal_temp_unlink_buffer
42        0.0043  jbd.ko                   journal_put_journal_head

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