fix: enable tcp_bbr to load automatically after reboot

[bombermine3]

Overview

Fix: Enable automatic loading of tcp_bbr module after reboot

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes in this pull request involve a modification to the enable-bbr target in the Makefile. A new command is added to append tcp_bbr to the /etc/modules file, ensuring that the BBR congestion control module is loaded automatically at system startup. This adjustment aims to enhance the configuration process for enabling BBR by making it persistent across reboots while leaving the rest of the Makefile unchanged.

Changes

File	Change Summary
Makefile	Modified the enable-bbr target to append tcp_bbr to /etc/modules for persistent loading.

Possibly related PRs

• fix: force no bbr when starting local devnet #3892: The changes in this PR involve disabling BBR congestion control, which is directly related to the main PR's focus on enabling BBR, highlighting a contrasting approach to managing BBR in the system.

Suggested reviewers

• rootulp
• staheri14
• evan-forbes
• ninabarbakadze
• cmwaters

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📜 Recent review details

Configuration used: .coderabbit.yaml
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between 160c51b and ef94ce6.

📒 Files selected for processing (1)

• Makefile (1 hunks)

🔇 Additional comments (1)

Makefile (1)

267-267: LGTM! The implementation correctly ensures tcp_bbr persistence.

The addition of tcp_bbr to /etc/modules follows the standard Linux practice for persistent module loading across reboots. This change effectively addresses the PR's objective by ensuring the BBR congestion control module is automatically loaded during system startup.

Let's verify the implementation:

Expected results:

• Test 1 should show that tcp_bbr is present in /etc/modules
• Test 2 should confirm BBR is the active congestion control algorithm

✅ Verification successful

The implementation correctly configures BBR persistence

The Makefile's enable-bbr target implements a complete and correct sequence for enabling BBR:

1. Loads the module immediately using modprobe tcp_bbr
2. Ensures persistence by adding tcp_bbr to /etc/modules
3. Configures the required sysctl parameters in /etc/sysctl.conf
4. Applies the changes with sysctl -p

The implementation follows Linux best practices for module persistence and system configuration.

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify that the tcp_bbr module is correctly configured
# Test 1: Check if tcp_bbr is listed in the modules file
rg -l 'tcp_bbr' /etc/modules

# Test 2: Verify BBR configuration in sysctl
sysctl net.ipv4.tcp_congestion_control

Length of output: 196

---

Script:

#!/bin/bash
# Let's verify the Makefile implementation instead
# Check the enable-bbr target and its configuration
rg -A 10 -B 10 'enable-bbr:' Makefile

# Also check for any other BBR-related configurations
rg 'tcp_bbr' Makefile

Length of output: 1165

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[evan-forbes]

dope, thanks

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