PostgreSQL Performance Halved on Linux Kernel 6.8: The THP Bug Every DBA Needs to Know [2026 Guide]
📰 Dev.to · Kunal
Learn how a Linux kernel commit halved PostgreSQL performance and how to fix it to prevent production database issues
Action Steps
- Check your Linux kernel version to see if you're affected by the THP bug
- Disable Transparent Huge Pages (THP) to fix the performance issue
- Monitor your PostgreSQL database performance after applying the fix
- Test your database under load to ensure the fix is effective
- Apply the fix to all affected production databases to prevent performance issues
Who Needs to Know This
DBAs and system administrators responsible for PostgreSQL databases on Linux systems need to know about this issue to prevent performance degradation
Key Insight
💡 Disabling Transparent Huge Pages (THP) can fix the PostgreSQL performance issue caused by a Linux kernel commit
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🚨 PostgreSQL performance halved on Linux Kernel 6.8 due to THP bug! 🚨 Learn how to fix it before it affects your production database
Key Takeaways
Learn how a Linux kernel commit halved PostgreSQL performance and how to fix it to prevent production database issues
Full Article
A single kernel commit halved PostgreSQL throughput on Linux 6.7 and 6.8. Here's exactly what happened, why Transparent Huge Pages were the culprit, and how to fix it before your production database pays the price.
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