Seems hung up on defining a ring buffer as something non-blocking (dropping). Having used ring buffers in both software and hardware systems for 40 years, we always called them ring buffers without this distinction. We would have called them all ring buffers. One nice thing about them is that it’s very easy to pass buffers back and forth between a single producer and single consumer without any locks or fancy memory atomics. All you need is a guarantee that memory writes occur in order. The AMD LANCE Ethernet controller (and many later derivatives) used this scheme to allow smooth overlapping of software frame processing with hardware transmission and reception way back in the 1980s.