On Wed, 2015-03-04 at 14:19 +0000, David Vrabel wrote: > On 04/03/15 14:09, Juergen Gross wrote: > > > > The main question whether it is worth to consider this alternative is > > the performance aspect. Does anyone have an idea which USB devices would > > typically be used via pvusb? I'd suspect memory sticks and USB disks > > and perhaps webcams being the most performance relevant ones. Is an > > additional copy operation of user data acceptable here? > > I have no idea. We (XenServer) have no use cases at all for USB device > passthrough. My gut feeling is that for USB 1 and 2 the bus itself isn't fast enough that anyone would care. qdisk has acceptable for disks, so it's probably ok for usb too. For usb 3 onwards, well, maybe when we care about those we'll decide that a kernel space driver is needed, but for now it seems like userspace would be ok. Ian. -- 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
