Re: Very high data rate isochronous USB device ?

Pete Zaitcev <[email protected]>
Newsgroups gmane.linux.usb.devel
Organization Red Hat, Inc.
Message-ID <[email protected]>
On Mon, 29 Jan 2007 19:50:37 +0100, Thierry Herbelot <[email protected]> wrote:

> I'm writing a USB device driver for a high-data rate device, for which I would 
> like to use isochronous transfers (I already have working bulk transfers), 
> but I can't get the expected (very high) data bandwidth.

So, don't use the ISO, duh. ISO is an inherently lossy, contrieved
access method, not well suitable for anything. It came about because
Intel hardware folks had no clue about the way media applications
actually worked. There's no reason whatsoever to design a new
device firmware with ISO endpoints.

> - I am using a quite recent linux kernel (2.6.18, coming with with OpenSuse 
> 10.2)

Har har har. Naive. Talk to Christopher Mongomery and Alan Stern about
the issues in detail if you're interested.

-- Pete

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