If I understand the USB Serial code correctly, at least open devices are constantly polled by 2 active URBs replaced immediately upon completion, except when the tty layer throttles them. With many of these devices, this creates significant USB bandwidth usage. At least one report found that it starts creating practical problems after 12 devices (on a BeagleBone), while adding a delay allows up to 60. Is there any reason not to have some small delay (perhaps user-configurable) between URB requests, at least while the device is not actively receiving data? If a patch is needed to implement this, what would be the recommended approach for a kernel complete-newbie? Thanks, Luke -- 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
