Ixy is an educational user space network driver for the Intel ixgbe family of 10 Gbit/s NICs (82599ES aka X520, X540, X550, X552, ...). Its goal is to show that writing a super-fast network driver can be surprisingly simple, check out the full description in the main repository of the C implementation to learn about the basics of user space drivers. Ixy was originally written in C as lowest common
