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USB Removable Media copying VERY SLOW

Hi all, I am using Ubuntu on a Latitude notebook and just noticed that copying a 23mb zip archive to the USB removable media that detects and browses fine is very slow - ie under windows when I have copied this sort of size the copy finishes much faster.

Any ideas why this would be - is there a mode or option that sets the data transfer rate. I have downloaded some 20 images off a digital camera, zipped them up and copied them to the USB to send to another member of the organisation.

In the past I would spend half my day in Windows doing Lotus Notes/MS-Office and Digital Camera stuff and now that I have Lotus running under WINE and OpenOffice is so good I am basically 99% free of Windows at work - this is great

Anyway I just thought that someone might know why this transfer might be so slow...

Will.*

BTW it is a USB v1 usb hub - though I don't know all the stats on it - or the exact capacity of the stick.

hello,

It sounds like the usb 1.0 hub is causing the problem.

If you type

lspci -v what do you get pertaining to the USB hub?

Also do lsmod and see whether there is a module for ohci or ehci, or something like that - can't remember the exact name.

Sounds like it's running at usb2 in wondoze and 1.1 in linux..........

Another cause could be supermount. I've seen much slower data rate with supermount enabled, than with manual mount/umount.

Yves.

lspci -v yields:

Code:

0000:00:1d.0 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #1) (rev 02) (prog -if 00 [UHCI])

        Subsystem: Intel Corp. Latitude C640

        Flags: bus master, medium devsel, latency 0, IRQ 11

        I/O ports at bf80 [size=32]

lsmod yields this that may be what you are refering to:
usbcore 104292 3 uhci_hcd

I do not know how to check for supermount.

here is syslog

Code:

Mar  1 08:11:16 localhost kernel: usbcore: registered new driver usb-storage

Mar  1 08:11:16 localhost kernel: USB Mass Storage support registered.

Mar  1 08:11:17 localhost kernel: SCSI device sda: 128001 512-byte hdwr sectors (66 MB)

Mar  1 08:11:17 localhost kernel: sda: Write Protect is off

Mar  1 08:11:17 localhost kernel: sda: Mode Sense: 43 00 00 00

Mar  1 08:11:17 localhost kernel: sda: assuming drive cache: write through

Mar  1 08:11:17 localhost kernel:  /dev/scsi/host0/bus0/target0/lun0: unknown partition table

Mar  1 08:11:17 localhost kernel: Attached scsi removable disk sda at scsi0, channel 0, id 0,  lun 0

Mar  1 08:11:17 localhost udev[5640]: configured rule in '/etc/udev/rules.d/udev.rules' at li ne 28 applied, 'sda' becomes '%k'

Mar  1 08:11:17 localhost udev[5640]: creating device node '/dev/sda'

Any further ideas on this data would be appreciated.

*.

Hmm,

I see what you are saying. It appears that the system things your USB hub is rather slower than it should really be....

I have a similar problem in that my front USB hub is running at 1.1 speed but it actually works at 2.0 speed in windoze....

here's my lspic -v:

Code:

00:02.0 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4) (prog

-if 10 [OHCI])

        Subsystem: nVidia Corporation: Unknown device 0c11

        Flags: bus master, 66Mhz, fast devsel, latency 0, IRQ 22

        Memory at e4002000 (32-bit, non-prefetchable) [size=4K]

        Capabilities: [44] Power Management version 2



00:02.1 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4) (prog

-if 10 [OHCI])

        Subsystem: nVidia Corporation: Unknown device 0c11

        Flags: bus master, 66Mhz, fast devsel, latency 0, IRQ 21

        Memory at e4003000 (32-bit, non-prefetchable) [size=4K]

        Capabilities: [44] Power Management version 2



00:02.2 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4) (prog

-if 20 [EHCI])

        Subsystem: nVidia Corporation: Unknown device 0c11

        Flags: bus master, 66Mhz, fast devsel, latency 0, IRQ 20

        Memory at e4004000 (32-bit, non-prefetchable) [size=256]

        Capabilities: [44] #0a [2080]

        Capabilities: [80] Power Management version 2

Now one of these is not wired to the case....

However,as I said the front one works as usb 2 in MS.
I belive this if 20 [EHCI]) indicates that it's usb 2.0

Not sure which USB hub is which yet though.

I am thinking to recompile my kernel with only support for ehci. I compiled it myself, so it's likely I made an error. Before I did that i remember it ran pretty fast. Did you compile yours?

I found this:

Code:

                                                         Supported by...

  ClassCode   USB standard   HCI standard        Speed    rs506a   OSR507

  =========   ============   ================   =======   ======   ======

  0x0c0300      USB 1.x      UHCI "Universal"    12Mbps      X        X

  0x0c0310      USB 1.x      OHCI "Open"         12Mbps               X

  0x0c0320      USB 2.0      EHCI "Enhanced"    480Mbps               X

my lsmod reveals this:

Code:

ohci_hcd 18436 0

So i think i am starting to understand this more now. I need the ehci module to be running guess. I had also better get my Mboard manual out to see which is which hub.

It looks like you only have a 1.1 hub. So i guess you need UHCI support........