Session

Understanding Linux Network Stack Overheads for High Speed Networks

Speakers

Qizhe Cai
Shubham Chaudhary
Midhul Vuppalapati
Jaehyun Hwang
Rachit Agarwal

Label

Nuts and Bolts

Session Type

Talk

Contents

Description

Datacenter access link bandwidths have recently increased by an order of magnitude. Building upon the conventional wisdom that kernel network stacks have unsustainable CPU overheads, our community is exploring a multitude of solutions: from partial hardware offload to user-space stacks to specialized hardware design. The design space explored by each of these solutions would benefit from a detailed understanding of precise kernel network stack overheads.
This paper presents analysis and insights from a year-long study on understanding CPU overheads of kernel network stacks for high-speed networks. Our study presents detailed insights on CPU inefficiencies in existing network stacks and has implications on de-
sign of future operating systems, network protocols, and hardware.