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.
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. Like all modern operating systems Windows has receive window auto-tuning to dynamically adjust the receive buffer size to the throughput and latency of the link. Disabling this feature will definitely limit your Internet speeds. Auto-tuning is consistent throughout all variants of TCP and present in all modern operating systems. @David Schwartz 'receive window auto tuning level' is normal on both and 'window scaling heuristics' are disabled (see updated config in OP). I believe this indicates that tuning is not restricted. – Chris Stankevitz Jun 12 '15 at 17:54. There are 5 modes for Receive Window Auto-Tuning: Disabled Fix the receive window at its default value. (65535 bytes) 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.
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:
To enable the Receive Window Auto-Tuning Level, use this command:
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Auto Tuning Windows 10 Disable
Here’s a list of available options for the autotuning parameter:
Disable Windows Auto Tuning
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.