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

To: xfs-masters@xxxxxxxxxxx
Subject: [Bug 43013] New: creating files >8GB on xfs / very slow
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Fri, 30 Mar 2012 12:36:21 GMT
Auto-submitted: auto-generated
https://bugzilla.kernel.org/show_bug.cgi?id=43013

           Summary: creating files >8GB on xfs / very slow
           Product: File System
           Version: 2.5
    Kernel Version: 3.2.x and 3.3.x
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: XFS
        AssignedTo: xfs-masters@xxxxxxxxxxx
        ReportedBy: itec@xxxxxxxxxxxxxxxxxxx
        Regression: No


Created an attachment (id=72755)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=72755)
ver_linux and other output for 3.2.0-rc1

How to reproduce the issue:
  dd if=/dev/zero of=/tmp/zero1.tmp bs=1024 count=13000000

  Where "/tmp" is on "/"
  and "/" is an xfs

  It does not happen if I create a file on another xfs then "/".

What happens:

  The first 8GB are written with about 100MB/s ans the rest with about 1MB/s.
  After the first 8GB kworker starts working heavily.

  top - 18:20:57 up 2:44, 2 users, load average: 1.33, 0.50, 0.42
  Tasks: 110 total, 3 running, 107 sleeping, 0 stopped, 0 zombie
  Cpu(s): 0.0%us, 49.8%sy, 0.0%ni, 50.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
  Mem: 1791092k total, 1723636k used, 67456k free, 8k buffers
  Swap: 0k total, 0k used, 0k free, 1564360k cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
   4160 root 20 0 0 0 0 R 47 0.0 0:06.81 kworker/0:1
   4217 root 20 0 0 0 0 R 47 0.0 0:06.12 kworker/1:0
   4216 root 20 0 11500 632 516 D 5 0.0 0:38.42 dd
   3281 root 20 0 17220 1240 904 R 0 0.1 0:11.11 top
   4079 root 20 0 0 0 0 S 0 0.0 0:00.43 kworker/1:2
   4093 root 20 0 0 0 0 S 0 0.0 0:00.21 kworker/0:0
      1 root 20 0 24172 2016 1100 S 0 0.1 0:00.46 init

I tested different kernel versions.

  first affected: kernel-3.2.0-rc1
  last affected:  current
  last unaffected: kernel-3.1.10

Further information: see attachments

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