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doc: tcp tunning update

- update with epoll tunning for kernels >= 2.6.27.8


Author: Andrei Pelinescu-Onciul <andrei@iptel.org>

Andrei Pelinescu-Onciul authored on 16/12/2008 14:30:48
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@@ -55,6 +55,10 @@ fs.file-max                 - maximum number of fds that will be allocated
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 1.5 other sysctl that might affect tcp connection rate or the maximum number
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     of open connections
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+fs.epoll.max_user_instances - maximum number of devices - per user (2.6.27.8+)
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+fs.epoll.max_user_watches   - maximum number of "watched" fds - per user
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+                              (2.6.27.8+)
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+
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 iptables  - remove the ip_conntrack module (it limits the maximum tcp
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  connections, adds extra overhead (slow)). It's probably better to remove
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   all the iptables modules.