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[mahmoh <709245@xxxxxxxxxxxxxxxxxx>]

Appears to still be a problem with 3.0.0-1:
...
Threaded I/O Tester:
    pts/tiobench-1.1.0 [Test: Write - Size Per Thread: 32MB - Thread Count: 4]
    Test 1 of 4
    Estimated Time Remaining: 4 Hours, 57 Minutes
    Estimated Test Run-Time: 28 Minutes
    Expected Trial Run Count: 4
        Started Run 1 @ 16:35:46
        Started Run 2 @ 16:36:28
<PING-START>
        Started Run 3 @ 16:37:06
        Started Run 4 @ 16:37:17  [Std. Dev: 73.18%]
        Started Run 5 @ 16:37:28  [Std. Dev: 61.73%]
        Started Run 6 @ 16:37:39  [Std. Dev: 54.21%]
<PING-STOP>
        Started Run 7 @ 16:37:50  [Std. Dev: 63.24%]
        Started Run 8 @ 16:38:31  [Std. Dev: 68.34%]

    Test Results:
        3.686
        3.746
        16.491
        16.656
        16.796
        16.874
        3.349
        3.933

    Average: 10.19 MB/s

^C
# uname -a
Linux panda-qa1 3.0.0-1-omap4 #0~dd1d9db SMP PREEMPT Wed Jul 20 19:41:32 CEST 2011 armv7l armv7l armv7l GNU/Linux

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https://bugs.launchpad.net/bugs/709245

Title:
  panda: USB disk IO slow

Status in Linaro Ubuntu Evaluation Builds:
  Confirmed
Status in Linaro Linux:
  Confirmed
Status in “linux-ti-omap4” package in Ubuntu:
  Confirmed

Bug description:
  My Panda's USB seems to be significantly slower than a Beagle C4.

  hdparm shows buffered reads as ~12MB/s on the Panda, and about ~20-25MB/s on a Beagle C4 from the same
  external Lacie USB disk.

  Kernel is 2.6.37-1002-linaro-omap

  Disk shows as:

  [    5.170440] scsi 0:0:0:0: Direct-Access     LaCie    d2 quadra             PQ: 0 ANSI: 4
  [    5.172546] sd 0:0:0:0: Attached scsi generic sg0 type 0
  [    5.175415] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks: (500 GB/465 GiB)

  The board is otherwise idle during the test.

  Doing perf_2.6.37-12 record -a dd if=/dev/sda of=/dev/null bs=4096
  count=100000

  shows :
      81.41%         swapper  [kernel.kallsyms]     [k] default_idle
       6.33%              dd  [kernel.kallsyms]     [k] __copy_to_user
       0.94%         swapper  [kernel.kallsyms]     [k] cpu_idle
       0.51%              dd  [kernel.kallsyms]     [k] __make_request
       0.51%  perf_2.6.37-12  [kernel.kallsyms]     [k] __copy_from_user

  
  which suggests it's not CPU constrained.

  Dave

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