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...5.4 systems. These tunings are for the TCP receive buffer windows: net.core.rmem_max net.core.wmem_max Information on this tuning is broadly available: http://fasterdata.es.net/TCP-tuning/linux.html http://www.speedguide.net/read_articles.php?id=121 Potential downsides are available: http://www.29west.com/docs/THPM/udp-buffer-sizing.html >From the above, the rmem size is a function of the number of listening processes times the size of the receive buffer. Apache can initially create a bunch of server processes (StartServers directive, for example). In our environment we may spawn off 50 or...