[Bug 12916] New: USB Mass Storage devices write 100 times slower than they are reading

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Ubuntu | linux

           Summary: USB Mass Storage devices write 100 times slower than
                    they are reading
           Product: Ubuntu
           Version: unspecified
          Platform: i386
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: linux
        AssignedTo: fabbione at ubuntu.com
        ReportedBy: spam.to.f at lkenhagen.de
         QAContact: kernel-bugs at lists.ubuntu.com


When i plug in a usb mass storage device, according to dmesg everything works
well. But as i try to write e.g. 70 MB of data to my usbsticks (tested one
noname and one built by hama) it will take half an hour. Once the data is
written i can copy it back to my harddrive within less than 15 seconds. If i try
to use the current stable hoary kernel 2.6.10-686, data is written in about 30
secs and read in 15, so it cant be the stick. Attached to this message there is
the dmesg output.

regards 
jan

[4294822.416000] usb 4-2: new high speed USB device using ehci_hcd and address
3[4294822.835000] Initializing USB Mass Storage driver...
[4294822.861000] scsi1 : SCSI emulation for USB Mass Storage devices
[4294822.863000] usb-storage: device found at 3
[4294822.863000] usb-storage: waiting for device to settle before scanning
[4294822.863000] usbcore: registered new driver usb-storage
[4294822.863000] USB Mass Storage support registered.
[4294827.864000]   Vendor: Hama      Model: FlashPen          Rev: 1.00
[4294827.864000]   Type:   Direct-Access                      ANSI SCSI revision: 00
[4294827.884000] usb-storage: device scan complete
[4294828.372000] SCSI device sda: 492544 512-byte hdwr sectors (252 MB)
[4294828.373000] sda: Write Protect is off
[4294828.373000] sda: Mode Sense: 23 00 00 00
[4294828.373000] sda: assuming drive cache: write through
[4294828.378000] SCSI device sda: 492544 512-byte hdwr sectors (252 MB)
[4294828.379000] sda: Write Protect is off
[4294828.379000] sda: Mode Sense: 23 00 00 00
[4294828.379000] sda: assuming drive cache: write through
[4294828.380000]  /dev/scsi/host1/bus0/target0/lun0: p1
[4294828.382000] Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0

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