USB Disk Speed

[dsr at tao.merseine.nu (dsr at tao.merseine.nu)]

On Fri, Sep 30, 2005 at 12:24:56PM -0400, Kent Borg wrote:
> On Thu, Sep 29, 2005 at 09:26:49PM -0400, Brendan wrote:
> > No need to fear, KNOPPIX still comes as a CD version...One just came out 6 
> > days ago...
> > 
> > ftp://ftp.knoppix.nl/pub/os/Linux/distr/knoppix/KNOPPIX_V4.0.2CD-2005-09-23-EN.iso
> 
> I booted my freshly burned Knoppix disk, and it is faster.  If I do
> two hdparm tests in immediate succession, the second now clocks in at
> 1 MB/second.  33% improvement!
> 
> But still way short of the 27 MB/s when I boot back to Ubuntu.
> 
> Does Knoppix have USB 2.0?  Is there some magic boot parameter needed
> to turn it on?  A detail: I did have the disk present as Knoppix was
> booting.

Look at the difference between lsmod on Knoppix and Ubuntu. Does
Ubuntu load ehci_hcd and Knoppix not do so? If so, then Knoppix
needs a modprobe ehci_hcd and a replugging of the USB drive.

-dsr-