Asymmetric speed results with testusb/usbtest/g_zero

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Hi,

I'm seeing peak rates of about 50 Mbps write speeds, and 150 Mbps read. Setup is host AMD SB700/SB800/Hudson-2/3 and Atheros SoC, using testusb tool with usbtest module and g_zero gadget module on TI AM335x.

Is this to be expected?
Is this a limitation of the controllers or the test setup?
Can anyone point me at speed numbers for testusb/usbtest/g_zero?

This is using tests 5 and 6 from testusb, which read/write various chained block sizes for various counts. The speeds mentioned are for the largest 32KB block size, on both the AMD and Atheros.

Thanks,
Conor
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