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what limits connections to Redhat servers?

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linux-howto

http://www.unix.com – Hey guys, We have two server environments that are acting different however they are different OS's... Ubuntu vs Redhat We have an Ubuntu environment that is able to maintain about 450 connections/second until about 120,000 connections. In our Redhat environment we are not able to match this or even come close. Both environments are almost identical hardware and are base OS installs. Can you guys give me some redhat kernel parameters that are possible culprits for throttling connections? It is especially noticeable once you get above 90k connections on the Redhat servers. Thanks (HowTos)