imsnif/bandwhich

bandwhich CPU utilization is too high

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#397 opened on Apr 5, 2024

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 (1 comment) (2 reactions) (0 assignees)Rust (7,686 stars) (237 forks)batch import
bughelp wanted

Description

bandwhich CPU utilization is too higher than iftop Here is two test case on x86_64 platform: Case I image image Case II image image

Contributor guide

Tech stack
rust
Domain
performancecli
Issue type
performance
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.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
RustProfiling toolsUnderstanding of network packet capture
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
First, profile the current CPU usage using tools like perf or flamegraph to identify hotspots. The main code resides in src/; focus on the packet capture loop and UI rendering. Check if there are any unnecessary allocations or busy waiting. Compare with iftop's approach (likely C) to see if there's a fundamental difference in polling frequency or data structures. Consider using async or lower level system calls to reduce overhead.