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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