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[Dario <dardiv92@xxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Invalid => Confirmed

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Dario (dardiv92)

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https://bugs.launchpad.net/bugs/1067452

Title:
  Low speed when transferring files over USB flash drives

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Low speed when transferring files over USB 2.0 and USB 3.0. Example USB flash devices with FAT that demonstrates this problem:
  ID 13fe:4100 Kingston Technology Company Inc.
  ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) 64MB QDI U2 DISK

  If the USB drive is not empty, the transferring speed is lower. the
  bigger the file, the slower the speed. Here are my tests:

  from HDD to USB (FAT):
  1. 450 MB in 4 sec. (USB sitck EMPTY) 112.5 MB/s
  2. 450 MB in 52 sec. (USB stick not EMPTY) 8.6 MB/s
  3. 735 MB in 26 sec. (USB stick EMPTY) 28.2 MB/s
  4. 735 MB in 40 sec. (USB stick not EMPTY) 18.3 MB/s
  5. 735 MB in 3 sec. (after formatting USB stick) 245 MB/s
  6. 1,5 GB in 3min35 (USB sitck EMPTY) 6.9 MB/s
  7. 1,5 GB in 4min31 (USB stick not EMPTY) 5.5 MB/s

  from HDD to USB (ext4)
  1. 450 MB in 1 sec. (USB sitck EMPTY) 450 MB/s
  2. 450 MB in 52 sec. (USB sitck not EMPTY) 8.6 MB/s
  3. 735 MB in 14 sec. (USB sitck EMPTY) 52.5 MB/s
  4. 735 MB in 1min (USB stick not EMPTY) 12.25 MB/s
  5. 735 MB in 16 sec. (after formatting USB stick) 45.9 MB/s
  5. 1,5 GB in 3min04 (USB sitck EMPTY) 8.1 MB/s
  6. 1,5 GB in 5min14 (USB stick not EMPTY) 4.7 MB/s

  from USB (FAT) to USB (FAT)
  1. 735 MB in 10 sec. (USB sitck EMPTY) 73 MB/s
  2. 735 MB in 4min (USB stick not EMPTY) 3.0 MB/s

  I tested the ext3 filesystem and I had the same results.

  This is not reproducible using USB external HDD with FAT:
  Bus 002 Device 003: ID 0766:0001 Jess-Link Products Co., Ltd

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-32-generic 3.2.0-32.51
  ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
  Uname: Linux 3.2.0-32-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu13
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  aleksej    1843 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xdf000000 irq 49'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,10431ba3,00100100 HDA:80862805,80860101,00100000'
     Controls      : 30
     Simple ctrls  : 14
  Date: Tue Oct 16 18:46:30 2012
  HibernationDevice: RESUME=UUID=89690659-5cf9-495f-9a95-8615f4f3b144
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: ASUSTeK Computer Inc. U36SD
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-32-generic root=UUID=f15fe73f-5542-4724-969b-90222a5cc2e3 ro quiet splash i915.i915_enable_rc6=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-32-generic N/A
   linux-backports-modules-3.2.0-32-generic  N/A
   linux-firmware                            1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: Upgraded to precise on 2012-05-15 (154 days ago)
  dmi.bios.date: 07/12/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: U36SD.205
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: U36SD
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrU36SD.205:bd07/12/2011:svnASUSTeKComputerInc.:pnU36SD:pvr1.0:rvnASUSTeKComputerInc.:rnU36SD:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: U36SD
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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