R2C2: A Network Stack for Rack-scale Computers – Public Review

For modern Internet data centers, a key challenge to meeting the immense compute, storage, and networking needs of next-generation applications is the ability of the underlying infrastructure to scale. An important new trend in this direction is the introduction of socalled “rack scale” computers, which are large numbers of tightly integrated systems-on-chip (SoC) processors, interconnected with a network fabric. The benefits of rack-scale computing include denser integration, lower cost and power, and larger scale. However, those benefits can only be achieved if the network fabric interconnecting the SoCs is capable of delivering low-latency, high-bandwidth, low congestion and loss packet delivery. This paper presents R2C2, which is a network stack for rack-scale computers.