Performance Tuning

Some Important settings for sysctl
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Already showed tcp_window_scaling issue
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By default, Linux networking not tuned for max performance,
more for reliability
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Buffers are especially not tuned for local 10GbE traffic
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Remember that Linux “autotunes” buffers for connections
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Don't forget UDP !
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Try via command line
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When you are happy with the results, add to /etc/sysctl.conf
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Look at documentation in /usr/src
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/usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.x86_64/Documentation/networking