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I am running OS X 10.11 - El Capitan. I am trying to tune my TCP setting for better network / Internet performance. Most of the settings I have been able to modify permanently through /etc/sysctl.conf configuration file.

I am trying to modify the value of net.inet.tcp.tcbhashsize to increase the number of TCP connections served and improve TCP lookup speeds. In Free BSD, it can be modified through /boot/loader.conf, but this file does not appear to exist in OS X.

How can this value be modified in OS X?

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sysctl is the tool of choice for this. sysctl net.inet.tcp.tcbhashsize will tell you its value, and sysctl -w net.inet.tcp.tcbhashsize=new_value will set the value. However on my system I got the error sysctl: oid 'net.inet.tcp.tcbhashsize' is read only when I tried to set the value – no idea if it's possible to set this value in some way without compiling and running your own kernel.

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