Linux TCP performance tuning - kernel sets "default" to higher than "max" value? [closed]

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http://stackoverflow.com – I've been going thru a variety of resources on Linux TCP tuning parameters for an nginx-based HTTP/JSON API server, including: http://www.lognormal.com/blog/2012/09/27/linux-tcpip-tuning/ http://www.speedguide.net/articles/linux-tweaking-121 http://kaivanov.blogspot.com/2010/09/linux-tcp-tuning.html http://www.linuxinstruction.com/?q=node/15 I've been checking default kernel values before modifying anything (Ubuntu 12.10) and noticed a weird thing: $ sudo sysctl -a|grep 'net\.core'|grep mem net.core.rmem_default = 212992 net.core.rmem_max = 131071 net.core.wmem_default = 212992 net.c (HowTos)