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

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Mon Jul 25 04:30:59 UTC 2005


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http://bugzilla.ubuntu.com/show_bug.cgi?id=12916
Ubuntu | linux


fabbione at ubuntu.com changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEEDINFO




------- Additional Comments From fabbione at ubuntu.com  2005-07-25 05:30 UTC -------
(In reply to comment #0)
> 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.

What kernel version are you using exactly?

> 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.

Reading time is tricky.. did you umount and unplug/replug the device before reading?
If not, you didn't even access the device (or partially) and all data have been
pulled from the cache.

> 
> regards 
> jan
> 
> [4294822.416000] usb 4-2: new high speed USB device using ehci_hcd and address

Can you please try and make sure that no other _hcd modules are loaded and repeat
the test?

Thanks
Fabio

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