In fact, there is one USB EHCI fix introduced in 2.6.32-41.88 to
address the problem, see
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/624510
That may explain why the upstream kernel test has a better
performance.
Thanks,
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https://bugs.launchpad.net/bugs/1071708
Title:
Copying to a USB device is extremely slow.
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