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Understanding AM18xx throughput - Performance

Hello all;

Please help me to understand the am18xx's performance issues with CDC/RNDIS section:

on this link:

http://processors.wiki.ti.com/index.php/DaVinci_PSP_03.20.00.14_Device_Driver_Features_and_Performance_Guide#USB_CDC-DMA_Performance

it says the performance of

USB Mass storage - Write: 24 mBytes/s at 96% cpuload

Sata writes:                            26 mBytes/s  at 99% cpu load

Ethernet :                                78 mbits/s    at  100% cpu load.

but usb-CDC:                                49mbits/s    at ??? cpu load.

CDC is on usb high speed(480 mhz) ; so why only 49 mbits?

what is the cpu load ? (100%?)

so is the conclusion that CDC/RNDIS on the HS usb are much slower than Ethernet's 100 mhz ?

Please help me to clarify. thank you.