What is swappiness on Ubuntu?

Swappiness (0-100) controls how aggressively Linux swaps RAM pages to disk. Default 60 favors swap early; 10 prioritizes your physical RAM.

How do I permanently lower swappiness to 10?

Edit `/etc/sysctl.conf` (sudo nano), add `vm.swappiness=10`, then `sudo sysctl -p`. Survives reboots.

Does reducing swappiness risk crashes?

Rarely — only if RAM truly exhausts, triggering OOM killer. For 16GB+ dev machines, it's safer, smoother.

🏗️ DevOps & Infrastructure

Ubuntu's Dirty Swap Secret: One Tweak to Unleash Your RAM

Your Ubuntu box has 32GB RAM, yet it lags switching tabs. Blame swappiness — Linux's stubborn love affair with disk swap. One sysctl command changes everything.

theAIcatchup Apr 11, 2026 4 min read

Ubuntu terminal outputting sysctl vm.swappiness=10 with low swap usage stats

⚡ Key Takeaways

Lower swappiness to 10 to prioritize RAM over swap, slashing lag on Ubuntu workstations. 𝕏
Default 60 is a relic from low-RAM eras; tune for modern SSDs and dev workloads. 𝕏
Temporary: `sudo sysctl vm.swappiness=10`; permanent via `/etc/sysctl.conf`. 𝕏

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theAIcatchup

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#Linux kernel tweaks #Linux performance #RAM performance #Ubuntu optimization #ram optimization #swappiness #swappiness tuning #ubuntu #ubuntu ram optimization #virtual memory

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Originally reported by Dev.to

⚡ Key Takeaways

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