I have the same poor performance on a Gigabyte GA-890GPA-UD3H with
usb3.0, and an 8GB usb3.0 super talent drive.  My write performance is
about 1/3 what it should be; I'm getting  7.49 MB/s sustained
(7519499595 byte file written in  written in 15m57s).

I also see the Stalled endpoint and short transfer warnings from
xhci_hcd.

This is with the most current Maverick amd64 kernel, 2.6.35-24-generic.

** Changed in: linux (Ubuntu)
       Status: Expired => New

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https://bugs.launchpad.net/bugs/647973

Title:
  USB 3.0 on 10.10 x86_64 : xhci_hcd WARN: Stalled endpoint

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