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From: Thierry Herbelot <thierry.herbelot@free.fr>
To: freebsd-usb@freebsd.org
Date: Fri, 28 Nov 2008 16:06:51 +0100
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Subject: usb2 bulk read optimization ?
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Hello,

another day, another question :

I'm done converting an old "userland driver" to usb2 and libusb20 - and it 
works ! (using the libusb API, for the time being).

The application is a data capture from a bulk endpoint, and I can't get more 
than around 8 Mbps. The data are formatted as URBs of 40 kbytes.

This may be expected, as the machine is an oldish Pentium-III, with an 
additional Acer-based USB-2 extension card.

(still, I have recompiled the -current kernel without the INVARIANTS and 
WITNESS options)

I have had a quick look at the code of libusb20 and tried an increase of 
bufsize in usb_get_transfer_by_ep_no, but with no discernable improvements.

	Any idea ?

	thanks

	TfH