https://bugzilla.kernel.org/show_bug.cgi?id=78651 --- Comment #3 from Joseph D. Wagner <joe@xxxxxxxxxxxxxxxxxx> --- To try to isolate the cause, I reformatted for EXT4 without a journal. It took 4:57:08, which is 1:30:21 faster than journal=writeback. The performance is also in line with XFS -- solid performance until about 60%, then a slow loss. I think it's reasonable to conclude that the problem is either 1) in the journal, or 2) exasperated by the journal. Full details below. Joseph D. Wagner #### #### Exhibit D #### #### EXT4 without a journal #### # su -c 'cd /root; nice ionice -c3 /usr/local/bin/lvbackup /dev/data/home /mnt/backup' Password: DUMP: mount: bad UUID DUMP: Date of this level 0 dump: Fri Jul 4 20:56:18 2014 DUMP: Dumping /dev/data/backup-data-home (an unlisted file system) to /mnt/backup/backup-data-home-20140704.205617-0.img DUMP: Label: none DUMP: Writing 64 Kilobyte records DUMP: mapping (Pass I) [regular files] DUMP: mapping (Pass II) [directories] DUMP: estimated 1683858285 blocks. DUMP: writing QFA positions to /mnt/backup/backup-data-home-20140704.205617-0.qfa DUMP: Volume 1 started with block 1 at: Fri Jul 4 20:56:34 2014 DUMP: dumping (Pass III) [directories] DUMP: dumping (Pass IV) [regular files] DUMP: 2.07% done at 115916 kB/s, finished in 3:57 DUMP: 4.06% done at 113802 kB/s, finished in 3:56 DUMP: 6.16% done at 115264 kB/s, finished in 3:48 DUMP: 8.22% done at 115393 kB/s, finished in 3:43 DUMP: 10.22% done at 114721 kB/s, finished in 3:39 DUMP: 12.24% done at 114460 kB/s, finished in 3:35 DUMP: 14.13% done at 113336 kB/s, finished in 3:32 DUMP: 16.08% done at 112677 kB/s, finished in 3:29 DUMP: 18.06% done at 112519 kB/s, finished in 3:24 DUMP: 19.92% done at 111700 kB/s, finished in 3:21 DUMP: 21.74% done at 110805 kB/s, finished in 3:18 DUMP: 23.41% done at 109263 kB/s, finished in 3:16 DUMP: 25.23% done at 108728 kB/s, finished in 3:12 DUMP: 26.88% done at 107565 kB/s, finished in 3:10 DUMP: 28.76% done at 107411 kB/s, finished in 3:06 DUMP: 30.24% done at 105899 kB/s, finished in 3:04 DUMP: 31.88% done at 105088 kB/s, finished in 3:01 DUMP: 33.34% done at 103814 kB/s, finished in 3:00 DUMP: 34.70% done at 102363 kB/s, finished in 2:59 DUMP: 36.17% done at 101378 kB/s, finished in 2:56 DUMP: 37.71% done at 100673 kB/s, finished in 2:53 DUMP: 39.44% done at 100494 kB/s, finished in 2:49 DUMP: 41.38% done at 100855 kB/s, finished in 2:43 DUMP: 43.05% done at 100558 kB/s, finished in 2:38 DUMP: 44.90% done at 100692 kB/s, finished in 2:33 DUMP: 46.76% done at 100787 kB/s, finished in 2:28 DUMP: 48.71% done at 101101 kB/s, finished in 2:22 DUMP: 50.25% done at 100583 kB/s, finished in 2:18 DUMP: 51.99% done at 100462 kB/s, finished in 2:14 DUMP: 53.77% done at 100449 kB/s, finished in 2:09 DUMP: 55.59% done at 100497 kB/s, finished in 2:04 DUMP: 57.36% done at 100404 kB/s, finished in 1:59 DUMP: 59.07% done at 100261 kB/s, finished in 1:54 DUMP: 60.89% done at 100320 kB/s, finished in 1:49 DUMP: 62.66% done at 100288 kB/s, finished in 1:44 DUMP: 64.16% done at 99842 kB/s, finished in 1:40 DUMP: 65.73% done at 99529 kB/s, finished in 1:36 DUMP: 67.26% done at 99174 kB/s, finished in 1:32 DUMP: 68.50% done at 98419 kB/s, finished in 1:29 DUMP: 70.10% done at 98196 kB/s, finished in 1:25 DUMP: 71.73% done at 97990 kB/s, finished in 1:20 DUMP: 73.28% done at 97734 kB/s, finished in 1:16 DUMP: 74.80% done at 97447 kB/s, finished in 1:12 DUMP: 76.43% done at 97252 kB/s, finished in 1:08 DUMP: 77.87% done at 96884 kB/s, finished in 1:04 DUMP: 79.49% done at 96739 kB/s, finished in 0:59 DUMP: 81.09% done at 96596 kB/s, finished in 0:54 DUMP: 82.91% done at 96708 kB/s, finished in 0:49 DUMP: 84.45% done at 96502 kB/s, finished in 0:45 DUMP: 85.60% done at 95864 kB/s, finished in 0:42 DUMP: 87.12% done at 95659 kB/s, finished in 0:37 DUMP: 88.67% done at 95490 kB/s, finished in 0:33 DUMP: 90.15% done at 95260 kB/s, finished in 0:29 DUMP: 91.97% done at 95387 kB/s, finished in 0:23 DUMP: 93.62% done at 95328 kB/s, finished in 0:18 DUMP: 95.20% done at 95216 kB/s, finished in 0:14 DUMP: 96.63% done at 94950 kB/s, finished in 0:09 DUMP: 98.19% done at 94824 kB/s, finished in 0:05 DUMP: 99.64% done at 94595 kB/s, finished in 0:01 DUMP: Closing /mnt/backup/backup-data-home-20140704.205617-0.img DUMP: Volume 1 completed at: Sat Jul 5 01:53:42 2014 DUMP: Volume 1 1683896576 blocks (1644430.25MB) DUMP: Volume 1 took 4:57:08 DUMP: Volume 1 transfer rate: 94452 kB/s DUMP: 1683896576 blocks (1644430.25MB) on 1 volume(s) DUMP: finished in 17810 seconds, throughput 94547 kBytes/sec DUMP: Date of this level 0 dump: Fri Jul 4 20:56:18 2014 DUMP: Date this dump completed: Sat Jul 5 01:53:42 2014 DUMP: Average transfer rate: 94452 kB/s DUMP: Archiving dump to /mnt/backup/backup-data-home-20140704.205617-0.toc DUMP: DUMP IS DONE Logical volume "backup-data-home" successfully removed -- You are receiving this mail because: You are watching the assignee of the bug. -- 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
