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measuring usb transfer throughput

Hi,

I am trying to measure usb transfer throughput by timing file read
operations from a usb flashdisk into main memory. The results seems to
be imprecise and I suspect this is due to filesystem caching. How
could I prohibit filesystem caching in the kernel?

Do you know of any GPL'ed usb benchmarks? Maybe I should measure this
in the kernel rather then application space?

Thanks,
Bahadir

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