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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

This issue appears to be an upstream bug, since you tested the latest
upstream kernel. Would it be possible for you to open an upstream bug
report[0]? That will allow the upstream Developers to examine the issue,
and may provide a quicker resolution to the bug.

Please follow the instructions on the wiki page[0]. The first step is to
email the appropriate mailing list. If no response is received, then a
bug may be opened on bugzilla.kernel.org.

Once this bug is reported upstream, please add the tag: 'kernel-bug-
reported-upstream'.

[0] https://wiki.ubuntu.com/Bugs/Upstream/kernel

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https://bugs.launchpad.net/bugs/1582759

Title:
  Unexpected low write rate with Lexar JumpDrive P20 64GB flash drives

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  We are hitting an unexpected low write rate with Lexar JumpDrive P20
  64GB flash drives connected via USB 3.0 on multiple machines and
  across multiple kernels (3.13, 4.4). Expected is a write rate of 270
  MB/s and we only get 45 MB/s. Under Mac OS X and Windows we get the
  expected write rate of 270 MB/s. The read rate is as expected at 400
  MB/s on all operating systems.

  
  Lexar JumpDrive P20 details:
  http://www.lexar.com/flash-drives/jumpdrive-p20

  
  Tested machines:
  * HP Z440
  * Lenovo ThinkPad X250

  
  Tested kernels:
  * 3.13 (Trusty)
  * 4.4 (Xenial)

  
  lsusb details:

  $ lsusb -t
  /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
      |__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M  <-- USB 3.0
  /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/11p, 480M
      |__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=, 12M
      |__ Port 8: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
      |__ Port 8: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
  /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
      |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M


  $ sudo lsusb -d 05dc:a212 -vvv

  Bus 003 Device 002: ID 05dc:a212 Lexar Media, Inc. 
  Device Descriptor:
    bLength                18
    bDescriptorType         1
    bcdUSB               3.00
    bDeviceClass            0 (Defined at Interface level)
    bDeviceSubClass         0 
    bDeviceProtocol         0 
    bMaxPacketSize0         9
    idVendor           0x05dc Lexar Media, Inc.
    idProduct          0xa212 
    bcdDevice            1.00
    iManufacturer           1 Lexar
    iProduct                2 USB Flash Drive
    iSerial                 3 0C5E8B182D1D474C
    bNumConfigurations      1
    Configuration Descriptor:
      bLength                 9
      bDescriptorType         2
      wTotalLength           44
      bNumInterfaces          1
      bConfigurationValue     1
      iConfiguration          0 
      bmAttributes         0x80
        (Bus Powered)
      MaxPower              224mA
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        0
        bAlternateSetting       0
        bNumEndpoints           2
        bInterfaceClass         8 Mass Storage
        bInterfaceSubClass      6 SCSI
        bInterfaceProtocol     80 Bulk-Only
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x81  EP 1 IN
          bmAttributes            2
            Transfer Type            Bulk
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0400  1x 1024 bytes
          bInterval               0
          bMaxBurst               3
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x02  EP 2 OUT
          bmAttributes            2
            Transfer Type            Bulk
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0400  1x 1024 bytes
          bInterval               0
          bMaxBurst               3
  Binary Object Store Descriptor:
    bLength                 5
    bDescriptorType        15
    wTotalLength           22
    bNumDeviceCaps          2
    USB 2.0 Extension Device Capability:
      bLength                 7
      bDescriptorType        16
      bDevCapabilityType      2
      bmAttributes   0x00000006
        Link Power Management (LPM) Supported
    SuperSpeed USB Device Capability:
      bLength                10
      bDescriptorType        16
      bDevCapabilityType      3
      bmAttributes         0x00
      wSpeedsSupported   0x000e
        Device can operate at Full Speed (12Mbps)
        Device can operate at High Speed (480Mbps)
        Device can operate at SuperSpeed (5Gbps)
      bFunctionalitySupport   2
        Lowest fully-functional device speed is High Speed (480Mbps)
      bU1DevExitLat          10 micro seconds
      bU2DevExitLat        2047 micro seconds
  Device Status:     0x000c
    (Bus Powered)
    U1 Enabled
    U2 Enabled

  
  Write speed with kernel 4.4:

  $ sudo dd if=/dev/zero of=/dev/sdb bs=1M count=256
  256+0 records in
  256+0 records out
  268435456 bytes (268 MB) copied, 5.98705 s, 44.8 MB/s

  
  Write speed under Mac OS X:

  $ sudo dd if=/dev/zero of=/dev/rdisk2 bs=1048576 count=256
  256+0 records in
  256+0 records out
  268435456 bytes transferred in 0.941998 secs (284963933 bytes/sec)
  --- 
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  test       1249 F.... pulseaudio
   /dev/snd/controlC1:  test       1249 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=78c6220a-1695-4cce-bea4-54c32e2568ed
  InstallationDate: Installed on 2016-05-18 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  MachineType: Hewlett-Packard HP EliteBook 840 G1
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=81dd7ff9-ab0b-42f5-87f4-10ebb94e99f6 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  Tags:  xenial
  Uname: Linux 4.4.0-22-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 03/25/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L71 Ver. 01.10
  dmi.board.name: 198F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 15.54
  dmi.chassis.asset.tag: 1300144
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.10:bd03/25/2014:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3008CD10003:rvnHewlett-Packard:rn198F:rvrKBCVersion15.54:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G1
  dmi.product.version: A3008CD10003
  dmi.sys.vendor: Hewlett-Packard

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