Comment posted Optimizing Linux TCP/IP Networking to increase Linux Servers Performance by .
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A very precious tool when talking of network optimization is HP's Linux version of netperf which was originally heavily used on HP-UX. Also some tcpdump / iptraf tests often comes handy to monitor if there is a weird traffic going on (Network Broadcast floods etc.)
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More useful sysctl options under some circumstances:
http://www.pc-freak.net/files/sysctl-server-performance.conf
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