Windows 2008 Receive Window Auto Tuning Level

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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). Highlyrestricted: allows the receive window to grow beyond its default value, very conservatively. Performance tuning on a Windows 2008 R2 and Windows 7 systems. Microsoft has incorporated a new feature 'TCP Auto-Tuning'. The TCP receive window autotuning.

  1. Receive Window Auto Tuning Level
  2. Disable Windows Auto Tuning Level
  3. Windows 2008 Receive Window Auto Tuning Level 6

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.

Aug 13, 2016  An Update on Windows TCP AutoTuningLevel Posted: 12 Aug 2016 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. This occurs because certain routers do not support the Receive Window Auto-Tuning feature. NoteSince the release of Windows 7, Receive Window Auto-Tuning is now available for programs that use the Windows Internet (WinINet) application programming interface (API). Oct 05, 2018  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. Aug 28, 2016  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. 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.

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:

If you see ‘normal’ written against Receive Window Auto-Tuning Level, it means that the feature is enabled and it is working fine.

Receive Window Auto Tuning Level

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

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Right-click on it > New > DWORD Value. Type TcpAutotuning and give it a vale of 1.

Click OK and exit.

Disable Windows Auto Tuning Level

To disable Receive Window Auto-Tuning feature for HTTP traffic, give it a value of 0 or delete the created TcpAutotuning DWORD.

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.

Windows 2008 Receive Window Auto Tuning Level 6

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.