is there usb bandwidth mearing tool?

Tue Jun 9 09:48:57 UTC 2009

Dear all:
When I drag files from/to usb flash on my ubuntu, I can see there is a file
operation dialog which tells me how fast it is right now.
Like 20Mbytes/s,etc.
How does ubuntu do that?
Does ubuntu count the duration of sending bulk to receive completion
interrupt?
Or there is another tool or driver option in kernel to reach this?
appreciate your help,
miloody
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