On Sun, 29 Sep 2013, Markus Rechberger wrote: > >> > Do you have a userspace test program that we can use to verify that this > >> > does work, and that others can use to run on some different platforms to > >> > verify that this is actually faster? > >> > > >> > >> You will need one of our devices for testing I guess. Some scanners > >> (which use USBFS) or other low speed devices won't really utilize > >> usbfs too much. I think I could provide some grabber device for > >> testing if you want to. > > > > So no test userspace program you can knock up for us? I really hate > > adding new core functionality to the kernel that I have no way of > > testing at all, that's a recipe for it quickly breaking... > > > > Well do you have any device which has a userspace driver? Without a > device you can barely test it. > There's a settopbox company which added the backported patch to Linux > 3.2 they use USB cardreaders and even tested the devices with and > without mmap support. > I doubt that the SG support has any good testing on low end systems, > I'm worried that it will introduce those latency issues again which we > saw with 15k buffers. There are lots of userspace drivers based on libusb or libusbx. If you post an enhancement for libusbx to make use of your buffer mappings, many people will be able to test it. 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
