Axis, looks your usb mass storage device has a bad read performance, and
looks nothing mistaken is observed in your trace.
See below traffic captured[1]:
It is a whole process to read 120K data from usb mass storage device, and
about 28ms is taken to get the 120K data from device, so the max read
performance is about (1000/28)*120K= 4MB/sec, which is near to your
observation. (120K is the max single transfer length)
Considered you are sure that writing has good performance, so usb host
controller and its driver should be OK, also all transfers are completed
successfully.
[1],
f6305800 715769963 S Bo:1:003:2 -115 31 = 55534243 5e000000 00f00000
80000a28 00020009 00000078 00000000 000000
f6305800 715770062 C Bo:1:003:2 0 31 >
......
f6305800 715785474 S Bi:1:003:1 -115 13 <
f6305800 715797937 C Bi:1:003:1 0 13 = 55534253 5e000000 00000000 00
On Sat, Mar 10, 2012 at 10:45 AM, Axis Mann <axism...@hotmail.com> wrote:
> Ahhh..maybe I can deliver the trace using the Attachment feature this
> way?
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/624510
Title:
Copying To USB Is Very Slow
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