microsoft/msquic

Use eBPF to Do CID-based RSS on Linux

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#2,444 opened on Mar 1, 2022

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Area: PerformanceOS: Linuxfeature requesthelp wanted

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Description

Describe the feature you'd like supported

We already use cBPF very minimally to do RSS on Linux but we don't do it based on the (short header) CID. The rest of the QUIC layers are already optimized to take advantage of it.

Proposed solution

Do RSS based on QUIC CID instead of tuple hash.

Additional context

Interesting blog related from Cloudflare: https://blog.cloudflare.com/unimog-cloudflares-edge-load-balancer/.

Contributor guide

Research direction
Study the existing cBPF RSS code in msquic, design an eBPF program that extracts the QUIC Connection ID from packets and computes a hash for RSS, and implement it using the Linux eBPF infrastructure. Reference the Cloudflare blog for patterns.
Tech stack
c
Domain
backendperformance
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
CeBPFLinux
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35