Re: Very high data rate isochronous USB device ?

Le Monday 29 January 2007 20:11, Pete Zaitcev a écrit :
> 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.

Anyway, the USB standard happens to allow precisely this way of transferring 
data, and I would be very surprised if the kernel maintainers (or the subset 
in charge of USB) would by their own decision *not* support the full 
standard, when the underlying chipset obviously does.
>
> > - 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.

This is precisely why I posted to a technical mailing list. I am absolutely 
delighted by your most constructive comments.

	TfH

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