[Bug 1113465] Re: USB 3.0 slow as USB 2.0 on 12.04 64 bit

[Launchpad Bug Tracker]

[Expired for util-linux (Ubuntu) because there has been no activity for
60 days.]

** Changed in: util-linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1113465

Title:
  USB 3.0 slow as USB 2.0 on 12.04 64 bit

Status in “util-linux” package in Ubuntu:
  Expired

Bug description:
  I'm using an USB 3.0 external hardisk Toshiba model HDTB105EK3AA on my Ubuntu 12.04 installation. It works fine but the transfer rate is around 28 MB/s both reading or writing. Is it the right transfer rate? The expectation was over 60 MB/s
  The internal hardisk is Sata II and the only activity on the system is the copy to usb disk.
  The motherboard is ASUS F2A85VPRO and CPU is AMD quad core A85600K.
  This is the result of lsb_release -a; uname -a; lsusb
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 12.04.2 LTS
  Release:	12.04
  Codename:	precise
  Linux Sala 3.2.0-37-generic #58-Ubuntu SMP Thu Jan 24 15:28:10 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 010 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 003 Device 002: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
  Bus 010 Device 002: ID 0480:a006 Toshiba America Info. Systems, Inc. 

  and this is the dmesg | tail after mounting the USB hardisk.
  [ 4805.343717] usb 10-2: new SuperSpeed USB device number 3 using xhci_hcd
  [ 4805.361695] scsi9 : usb-storage 10-2:1.0
  [ 4808.566291] scsi 9:0:0:0: Direct-Access     TOSHIBA  External USB 3.0 0101 PQ: 0 ANSI: 6
  [ 4808.567385] sd 9:0:0:0: Attached scsi generic sg2 type 0
  [ 4808.596448] sd 9:0:0:0: [sdb] 976773164 512-byte logical blocks: (500 GB/465 GiB)
  [ 4808.612235] sd 9:0:0:0: [sdb] Write Protect is off
  [ 4808.612244] sd 9:0:0:0: [sdb] Mode Sense: 1f 00 00 00
  [ 4808.623156] sd 9:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
  [ 4808.725111]  sdb: sdb1
  [ 4808.839539] sd 9:0:0:0: [sdb] Attached SCSI disk
  ricky at Sala:~$ ^C

  Many thanks!
  Ricardo

  --- 
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  DistroRelease: Ubuntu 12.04
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  NonfreeKernelModules: fglrx
  Package: util-linux 2.20.1-1ubuntu3
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.2.0-38.61-generic 3.2.37
  Tags:  precise running-unity
  Uname: Linux 3.2.0-38-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare scanner sudo vboxusers video

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