Receive Window Auto-tuning Level Is Set To Normal
Window Auto-Tuning feature is said to improve the performance for programs that receive TCP data over a network. It is nothing new. It was introduced in Windows Vista and is present in Windows 10 too. In today’s Internet, the range of latencies & throughput speeds is just too large to manage statically. It needs to be adjusted dynamically. Windows 10 will dynamically adjust the receive buffer size to the throughput and latency of the link, using this feature.
Programs like Automatic Updates, Windows Update, Remote Desktop Connection, Windows Explorer for network file copy, etc, use WinHTTP or Windows HTTP Services.
Window Auto-Tuning feature is enabled by default in Windows 10 and makes data transfers over networks more efficient. But if your network uses an old router or your firewall software does not support this feature, then you may experience slow data transfers or even loss of connectivity.
To check the status of Auto-Tuning feature on your system, in an elevated command prompt windows, type the following and hit Enter:
May 05, 2016 If you notice above, the line Receive Window Auto-Tuning Level is set to normal. This is the default setting out of the box. To turn off TCP Auto-tuning you can use the following command: netsh interface tcp set global autotuninglevel=disabled. Edit: the following can be used to check your current setting, look for 'Receive Window Auto-Tuning Level:' netsh interface tcp show global it seems like the setting is already 'normal' for a lot of people, but if yours isn't, it could be hampering your speed without. Mar 29, 2010 TCP Auto-Tuning To turn off the default RWIN auto tuning behavior, (in elevated command prompt) type: netsh int tcp set global autotuninglevel=disabled The default auto-tuning level is 'normal', and the possible settings for the above command are: disabled: uses a fixed value for the tcp receive window. Limits it to 64KB (limited at 65535). In Windows Vista, Windows Server 2008, and later versions of Windows, the TCP Receive Window size is negotiated by a feature that is named TCP Receive Window Auto-Tuning Level. This feature can negotiate a defined Receive Window size for every TCP communication during the TCP Handshake.
If you see ‘normal’ written against Receive Window Auto-Tuning Level, it means that the feature is enabled and it is working fine.
To disable Windows AutoTuning, run the following command:
To enable Windows AutoTuning, run the following command:
You can also tweak the Windows Registry, says KB947239. To enable the Receive Window Auto-Tuning feature for HTTP traffic, Run regedit and navigate to the following registry subkey:
HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionInternet SettingsWinHttp
Right-click on it > New > DWORD Value. Type TcpAutotuning and give it a vale of 1.
Click OK and exit.
To disable Receive Window Auto-Tuning feature for HTTP traffic, give it a value of 0 or delete the created TcpAutotuning DWORD.
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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.
Receive Window Auto-tuning Level Is Set To Normal Level
Let the default settings of Window Auto-Tuning feature be enabled. If your network uses an old router or your firewall software does not support this feature, and you are experiencing poor or no connectivity issues, only then may you disable this feature and see if it works in your favor.