USB with SAMV71Xplained DataRate

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Hi All, Do you have experience/figures in the USB project, that the maximum data rate for the Isochronous transfer can reached. for the USB with  SAMV71Xplained

I found my Isochronous channel is bounded at around 11Mbyte/s, while, I am not sure if we could come up to the speed of 24Mbyte/s, which is the desired maximum of the USB2.0 High Speed. I am just doing the sample code for usb_video.And the code is just as simple as that continuous streaming thru USB by continuous callback.

Did I missed any setting?