On Mon, 12 Mar 2012, Paul Zimmerman wrote: > > Anyway, it's possible to do this sort of testing already by using > > gadgetfs with the "usb.c" test program, if you compile it with the > > -DAIO option. > > Hmm, I see. Is gadget zero considered obsolete then, if everything > can be done using usb.c and gadgetfs? I wonder why gadget zero is > still maintained? It has support for super speed, for example, while > gadgetfs does not. I think the answer is that gadgetfs is pretty much unmaintained at this point (the original author passed away and nobody else has taken over). Felipe is the closest approximation, since he now maintains the entire gadget subsystem, but he hasn't done much direct work on gadgetfs. > Do you think there could be a problem moving data at high- > bandwidth super speed rates (48K bytes every 125 usec) using > gadgetfs? It would be somewhat less efficient than using an in-kernel driver. As far as I know, nobody has ever tried to measure exactly how much less efficient. And whether or not it would cause a problem depends on the speed of the system. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
