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[Darek <1242085@xxxxxxxxxxxxxxxxxx>]

** Summary changed:

- 0951:1697 [Asus P5WD2-Premium] Low write speed to USB disks
+ Low write speed to USB disks

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

** Tags added: disk speed usb

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https://bugs.launchpad.net/bugs/1242085

Title:
  Low write speed to USB disks

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Using a Kingston DT Ultimate G3 (32GB) the "Disks" tool shows write
  speed about 7 MB/s !!! After start benchmark this tool shows write
  speed about 17 MB/s but immediately goes below 10 MB/s. Same low speed
  during copy e.g. 3GB file manually to USB 3.0 disk. This does not
  occur on read, only write.

  Similar low write speed problem is for disks:
  - Seagate Expansion Portable Hard Drive 500GB (model inside ST500LT012-9WS142)
  - Verbatim Store 'n' Go SuperSpeed USB 3.0 Portable Hard Drive 500GB (model inside ST500LM0 12 HN-M500MB)

  I report this bug from PC, but the same bug is on my laptop Asus X55U.
  Even the write speed on my laptop is more important to me.

  What I found about this bug (VERY IMPORTANT NOTE):
  - In old realese 12.04 LTS disks works OK.
  - In 13.04 disks works faster than it is now in 13.10.
  - If disk is formatted as NTFS the write speed is the lowest.
  - If disk is formatted as EXT4 the speed is x2 better.
  - If disk is formatted as FAT32 is low too.
  - No matter if disk is connected via USB 2.0 or USB 3.0. The low write speed is always the same.
  - This problem doesn't exists in Windows (so this is no hardware or BIOS problem).
  - This problem doesn't exists in OpenSUSE (so this is no hardware or BIOS problem).
  - No matter if there is UEFI. Laptop Asus X55U has UEFI but PC has not.
  - Hardware - no matter (same is on laptop ASUS X55U, I report from my PC now)
  - No matter if Ubuntu is 32 or 64 bit mode.

  ---
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  user-pc    1424 F.... pulseaudio
   /dev/snd/controlC0:  user-pc    1424 F.... pulseaudio
  CurrentDmesg:
   [   20.325188] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
   [  167.464491] systemd-hostnamed[2044]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
   [ 1467.583396] systemd-hostnamed[2164]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
   [ 5670.978467] systemd-hostnamed[2802]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=4b9c34cd-9ce1-4ac3-ac15-3801b2fcc06b
  InstallationDate: Installed on 2013-10-18 (1 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  IwConfig:
   eth0      no wireless extensions.

   eth1      no wireless extensions.

   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=2f9a3d14-fd4f-4d71-87d1-05e40c87052e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill:

  Tags:  saucy
  Uname: Linux 3.11.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 09/23/2005
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0519
  dmi.board.name: P5WD2-Premium
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0519:bd09/23/2005:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5WD2-Premium:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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