Re: USB 2.0 speed

[Paolo Alexis Falcone <pfalcone@gmail.com>]

On Fri, 22 Oct 2004 13:06:38 +0300, Alexandros Papadopoulos
<apapadop@alumni.carnegiemellon.edu> wrote:
> I have an external HDD case, that is USB 2.0 certified. When I boot my
> machine with KNOPPIX and have the USB case plugged, I get fast transfer
> rates to my external disk (10MB/sec or so).
> 
> When I boot my regual installation of Debian (sarge), with both kernels
> 2.4.25 and 2.6.8 (installed via apt-get), the same modules are loaded
> (uhci-hcd and friends), but the system can only exchange data with the
> external drive VERY slowly (less than 500kb/sec).
> 
> usbview shows me at that time that the external USB device (correctly)
> advertises speeds of up to 480Mbps, but actual file transfers are
> extremely slow.

USB 2.0 should use the EHCI driver. Try preloading the module and see
what happens.

-- 
Paolo Alexis Falcone
pfalcone@gmail.com