in Network, Windows, Windows Server

How to disable Receive Window Auto-Tuning Level in Windows 7 / 2008

The Receive Window Auto-Tuning feature lets the operating system continually monitor routing conditions such as bandwidth, network delay, and application delay. Therefore, the operating system can configure connections by scaling the TCP receive window to maximize the network performance. To determine the optimal receive window size, the Receive Window Auto-Tuning feature measures the products that delay bandwidth and the application retrieve rates. Then, the Receive Window Auto-Tuning feature adapts the receive window size of the ongoing transmission to take advantage of any unused bandwidth.

While the feature may improve speed, in some cases it can also cause problems and slow down the network.

To disable the feature, use this command:

netsh interface tcp set global autotuning=disabled

To see if the feature is enabled or disabled, use this command:

netsh interface tcp show global

To enable the Receive Window Auto-Tuning Level, use this command:

netsh interface tcp set global autotuning=normal

Here’s a list of available options for the autotuning parameter:

disabled: Fix the receive window at its default value.
highlyrestricted: Allow the receive window to grow beyond its default value, but do so very conservatively.
restricted: Allow the receive window to grow beyond its default value, but limit such growth in some scenarios.
normal: Allow the receive window to grow to accommodate almost all scenarios.
experimental: Allow the receive window to grow to accommodate extreme scenarios. WARNING: This can dramatically degrade performance in common scenarios and should only be used for research purposes.

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