4.1 Processor folding, Active System Optimizer, and simultaneous multithreading4.1.1 Active System Optimizer4.1.2 Simultaneous multithreading (SMT)4.1.3 Processor folding4.1.4 Scaled throughput4.2 Memory4.2.1 AIX vmo settings4.2.2 Paging space4.2.3 One TB segment aliasing4.2.4 Multiple page size support4.3 I/O device tuning4.3.1 I/O chain overview4.3.2 Disk device tuning4.3.3 Pbuf on AIX disk devices4.3.4 Multipathing drivers4.3.5 Adapter tuning4.4 AIX LVM and file systems4.4.1 Data layout4.4.2 LVM best practice4.4.3 File system best practice4.4.4 The filemon utility4.4.5 Scenario with SAP and DB24.5 Network4.5.1 Network tuning on 10 G-E4.5.2 Interrupt coalescing4.5.3 10-G adapter throughput scenario4.5.4 Link aggregation4.5.5 Network latency scenario4.5.6 DNS and IPv4 settings4.5.7 Performance impact due to DNS lookups4.5.8 TCP retransmissions4.5.9 tcp_fastlo4.5.10 MTU size, jumbo frames, and performance