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Re: USB 2.0 speed



On Sat, Oct 23, 2004 at 12:52:49AM +0300, Alexandros Papadopoulos wrote:
> On Friday 22 October 2004 15:08, Paolo Alexis Falcone wrote:
> > 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.
> 
> I added the module ehci-hcd in /etc/modules and rebooted, but there was 
> no improvement. My USB 2.0 device still works at 1.x speeds :-(

Same here, both the ehci and the uhci modules are loaded (and both found
their ports), but my USB 2.0 Memory Key only connects with USB 1 (as
seen in usbview).

LLAP, Martin

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