[$] Accelerating networking with AF_XDP

The Linux network stack does not lack for features; it also performs wellenough for most uses. At the highest network speeds, though, any overheadat all is too much; that has driven the most demanding users towardspecialized, user-space networking implementations that can outperform thekernel for highly constrained tasks. The express data path (XDP)development effort is an attempt to win those users back, with some apparentsuccess so far. With the posting of the AF_XDP patch set by Bjirn Tipel,another piece of the XDP puzzle is coming into focus.