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Date: Fri, 11 Apr 2014 12:08:57 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Daniel O'Connor <doconnor@gsoft.com.au>
Subject: Re: USB 3 devices not reliably connecting at 5Gbps
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On 04/11/14 09:29, Daniel O'Connor wrote:
> 	    usb_xf[i].xf = libusb_alloc_transfer(0);
> 	    usb_xf[i].idx = i;
> 	    usb_xf[i].done = 0;
> 	    usb_xf[i].submitted = 0;

I think you can get more speed in libusb:

                 x |= 1;
         }
         speed = libusb20_dev_get_speed(pdev);

         /* select a sensible buffer size */
         if (speed == LIBUSB20_SPEED_LOW) {
                 bufsize = 256;
         } else if (speed == LIBUSB20_SPEED_FULL) {
                 bufsize = 4096;
         } else {
                 bufsize = 16384;

^^^ add a clause for super-speed to use 32K/64K here:
         }

         xfer = libusb20_tr_get_pointer(pdev, x);

         if (xfer == NULL)
                 return (xfer);


See: src/lib/libusb

You can simply type "make all install" there.

--HPS