On Thu, May 17, 2018 at 07:03:24PM +0200, Guido Kiener wrote: > The working group "VISA for Linux" of the IVI Foundation > www.ivifoundation.org specifies common rules, shared libraries and > drivers to implement the specification of "VPP-4.3: The VISA Library" > on Linux to be compatible with implementations on other operating systems. > > The USBTMC protocol is part of the "VISA Library" that is used by many > popular T&M applications. > > An initial implementation for Linux based on libusb has been created. > While functional it has some drawbacks: > - Performance > - Requires root privileges to reclaim devices already claimed by > the usbtmc driver > > The following collaborative patches meet the requirements of the IVI > Foundation to implement the library based on the usbtmc driver. > > Improvements in the data transfer rate of over 130 MByte/s for > usb 3.x connections have been measured. Why is the libusb version "slower"? Last I checked, we could reach line-speeds for USB quite easily from userspace with no problem. If you keep the endpoints full you should be just fine. Unless you have a horrid protocol that doesn't allow for that :) thanks, greg k-h -- 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
