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.
Jul 05, 2007 Hi, my name is Katarzyna and I am the Program Manager within the Internet Protocols team. I have been asked a few times about the Receive Window Auto-Tuning feature on Vista and some associated issues people are having. One of the many cool new features on Windows Vista, Receive Window Auto-Tuning. Dec 23, 2019 TCP receive window autotuning. In Windows Vista, Windows Server 2008, and later versions of Windows, the Windows network stack uses a feature that is named TCP receive window autotuning level to negotiate the TCP receive window size. This feature can negotiate a defined receive window size for every TCP communication during the TCP Handshake. Notes: Setting is available in Windows 7, Vista (SP1), 2008 Server. Default value is 10 under Windows 7, similar behavior if the setting is not present in the Registry. Games that may be affected by this. By default, Windows in normal auto tuning level will use RWIN size of 256 bytes with a scale factor of 8. This value is not suitable for all routers and servers which does not support TCP scale factor, and continue to communicate with 65536 bytes (64kB). 64kB is the fixed default TCP receive buffer, and through autotuning. The symptoms exist due to the new re-written TCP stack introduced since Windows Vista that aims to take full advantage of hardware advances such as gigabit networking. Among the new feature in Windows TCP/IP is Receive Window Auto-Tuning Level for TCP connections.
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:
To see if the feature is enabled or disabled, use this command:
/does-cardi-b-use-auto-tune.html. To enable the Receive Window Auto-Tuning Level, use this command:
How to iso update use 3utools. 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.