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 > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
