How to get maximum TCP Receive/Send window in MAC OS X?

linux macos tcp sysctl
Vlad picture Vlad · Dec 22, 2010 · Viewed 9.5k times · Source

How to get maximum TCP Receive/Send window in MAC OS X?

There are two ctl in Linux. /proc/sys/net/core/rmem_max - Maximum TCP Receive Window (NET_CORE_RMEM_MAX) /proc/sys/net/core/wmem_max - Maximum TCP Send Window (NET_CORE_WMEM_MAX)

but i couldn't find how to get these parameters in mac os.

Does anybody know?

I have found the following ctls in MAC OS X: net.inet.tcp.recvspace, net.inet.tcp.sendspace, kern.ipc.maxsockbuf

It seems that recvspace+sendspace can't be greater than maxsockbuf. I have read about it here: http://www.macgeekery.com/tips/configuration/mac_os_x_network_tuning_guide_revisited

Answer

DarkDust picture DarkDust · Dec 22, 2010

I'm not 100% sure whether these are the correct ones, but try sysctl -n net.inet.tcp.recvspace and sysctl -n net.inet.tcp.sendspace. You can set them with sysctl -w (see man sysctl).

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