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[Bug 43013] creating files >8GB on xfs / very slow

To: xfs-masters@xxxxxxxxxxx
Subject: [Bug 43013] creating files >8GB on xfs / very slow
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Fri, 30 Mar 2012 15:14:35 GMT
Auto-submitted: auto-generated
In-reply-to: <bug-43013-470@xxxxxxxxxxxxxxxxxxxxxxxxx/>
References: <bug-43013-470@xxxxxxxxxxxxxxxxxxxxxxxxx/>
https://bugzilla.kernel.org/show_bug.cgi?id=43013





--- Comment #4 from ITec <itec@xxxxxxxxxxxxxxxxxxx>  2012-03-30 15:14:34 ---
Yes, I know, that there are many things that could affect the test.
And I am not speaking about loss of "some" performance. I am speaking about
loss of 98% performance. 

But what could cause this?
And why does it happen only on 3.2+?

About fragmentation:

  # xfs_fsr -v /dev/sda3
  / start inode=0
  ino=20294080
  ino=20294080 already fully defragmented.

  # df -m /tmp
  Filesystem     1M-blocks  Used Available Use% Mounted on
  /dev/sda3          15248  2549     12700  17% /

  # dd if=/dev/zero of=/tmp/zero1.tmp bs=1024 count=9000000
  9000000+0 records in
  9000000+0 records out
  9216000000 bytes (9,2 GB) copied, 396,978 s, 23,2 MB/s

  The first 8GB go with 100MB/s the rest with 1.9MB/s.

  # xfs_bmap /tmp/zero1.tmp
  /tmp/zero1.tmp:
        0: [0..4194303]: 26708152..30902455
        1: [4194304..8388607]: 11237112..15431415
        2: [8388608..12076735]: 4123968..7812095
        3: [12076736..15671151]: 19841872..23436287
        4: [15671152..16201615]: 18355464..18885927
        5: [16201616..16547543]: 30902456..31248383
        6: [16547544..16797911]: 3523816..3774183
        7: [16797912..16816479]: 3783176..3801743
        8: [16816480..16835343]: 3804000..3822863
        9: [16835344..16950519]: 15431416..15546591
        10: [16950520..16950551]: 15546600..15546631
        11: [16950552..17065255]: 10757704..10872407
        12: [17065256..17065295]: 10873000..10873039
        13: [17065296..17083887]: 10739112..10757703
        14: [17083888..17102567]: 10720432..10739111
        15: [17102568..17219047]: 10603952..10720431
        16: [17219048..17219079]: 10603920..10603951
        17: [17219080..17241775]: 10581224..10603919
        18: [17241776..17262391]: 10560608..10581223
        19: [17262392..17283671]: 10539328..10560607
        20: [17283672..17302879]: 10018552..10037759
        21: [17302880..17302887]: 10037976..10037983
        22: [17302888..17323039]: 9998400..10018551
        23: [17323040..17342535]: 9966824..9986319
        24: [17342536..17573871]: 18960144..19191479
        25: [17573872..17655255]: 19264640..19346023
        26: [17655256..17688759]: 18919824..18953327
        27: [17688760..17706695]: 18901888..18919823
        28: [17706696..17725951]: 19191480..19210735
        29: [17725952..17745271]: 18142008..18161327
        30: [17745272..17764551]: 18122728..18142007
        31: [17764552..17783799]: 18103480..18122727
        32: [17783800..17861359]: 15546632..15624191
        33: [17861360..17899223]: 25742880..25780743
        34: [17899224..17969279]: 26181368..26251423
        35: [17969280..17999999]: 26399192..26429911

# df -m /tmp
Filesystem     1M-blocks  Used Available Use% Mounted on
/dev/sda3          15248 11338      3911  75% /

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