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infrastructure/servers/performance-tuning/SKILL.md

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+---
+name: performance-tuning
+description: Optimize Linux system performance. Configure kernel parameters, analyze bottlenecks, and tune resources. Use when improving system performance.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# Performance Tuning
+
+Optimize Linux system performance.
+
+## System Monitoring
+
+```bash
+top / htop                # Process monitoring
+vmstat 1                  # Memory statistics
+iostat -x 1               # Disk I/O
+sar -n DEV 1              # Network statistics
+perf top                  # CPU profiling
+```
+
+## Kernel Parameters
+
+```bash
+# /etc/sysctl.d/99-performance.conf
+vm.swappiness = 10
+net.core.somaxconn = 65535
+net.ipv4.tcp_max_syn_backlog = 65535
+fs.file-max = 2097152
+vm.dirty_ratio = 40
+vm.dirty_background_ratio = 10
+```
+
+## File Descriptor Limits
+
+```bash
+# /etc/security/limits.conf
+* soft nofile 65535
+* hard nofile 65535
+* soft nproc 65535
+* hard nproc 65535
+```
+
+## Disk I/O
+
+```bash
+# Change scheduler
+echo noop > /sys/block/sda/queue/scheduler
+
+# Enable trim for SSDs
+fstrim -av
+```
+
+## Network Tuning
+
+```bash
+# Increase buffers
+sysctl -w net.core.rmem_max=134217728
+sysctl -w net.core.wmem_max=134217728
+```
+
+## Best Practices
+
+- Profile before optimizing
+- Change one parameter at a time
+- Monitor impact of changes
+- Document all tuning