Performance Tuning

Tools
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Monitor / debug tools
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mpstat – reveals per cpu stats, Hard/Soft Interrupt usage
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vmstat – vm page info, context switch, total ints/s, cpu
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netstat – per nic status, errors, statistics at driver level
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lspci – list the devices on pci, indepth driver flags
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oprofile – system level profiling, kernel/driver code
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modinfo – list information about drivers, version, options
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sar – collect, report, save system activity information
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Many others available- iptraf, wireshark, etc
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Sample use for some of these embedded in talk