Re: USB 2.0 speed

From: robin (robin_at_rektau.ukfsn.org)
Date: 10/23/04

  • Next message: J.H.M. Dassen (Ray): "Re: php4-gtk not available in testing/unstable repositories on Debian?" 
    Date: Sat, 23 Oct 2004 14:14:18 +0100
To: debian-user@lists.debian.org

    Cristi Banciu wrote:

    > Alexandros Papadopoulos 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.
    >>
    >> Anyone have any idea on how to troubleshoot this?
    >>
    >>
    > Try to load ehci modules. I have an usb-stick and if I mount it with
    > -o sync option I am able to transfer data at about 5Mb/sec, which is
    > pretty good for a flash drive.
    > I am using kernel 2.6.8 installed with apt-get.
    >
    >
    Hi
    Try http://www.linux-usb.org/usb2.html and http://www.linux-usb.org for
    some info.

    Robin 

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