08.04.2020

Windows 10 Tcp Auto Tuning Level

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.

  • 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 it can scale up to 16 MB.
  • Aug 13, 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. 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.

Aug 18, 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. 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.

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.

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.

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.

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.

Windows 10 have an auto-tuning feature which tries to dynamically adjust the receive buffer size for transmission and latency of the link. In-fact this feature is present in all Modern Operating systems including Windows 10. So, its a Necessary Feature all together as it manages and adjusts Receive buffer size dynamically.

How to Check if Auto Tuning Feature is Enabled ?

1 – Open Command Prompt as admin by Searching cmd in Windows 10 Search box and then right clicking on the cmd icon and clicking on Run as Administrator.

2 – Now, run the following command given below.

Tcp Auto Tuning

3 – In the output if Receive Windows Auto Tuning Level says Normal, then the Auto tuning Feature is enabled on your PC.


How to Disable Auto Tuning in Windows 10

# Using Command Prompt: –

Just run the command given below in Command Prompt

# Using Registry Editor:-

1] Press Windows key + R together.

2] Write Regedit and hit enter to Open registry editor.

3] Browse to the following location Given below.

4 ] Now, Right click anywhere on right side and create New -> DWORD (32-bit) Value

5 ] Now, Name this key TcpAutotuning .

6 ] Double click on it and Edit Value data to 0.

Windows Auto Tuning Level

How to Enable Auto Tuning in Windows 10

# Using Command Prompt: –

Just run the command given below in Command Prompt

# Using Registry Editor:-

Tcp Autotuning Windows 10

1] Press Windows key + R together.

2] Write Regedit and hit enter to Open registry editor.

3] Browse to the following location Given below.

Windows 10 Tcp Auto Tuning Levels

4 ] Now, Right click anywhere on right side and create New -> DWORD (32-bit) Value if it does not exists.

Windows 10 Tcp Tuning Utility

6 ] Double click on it and Edit Value data to 0.

Saurav is associated with IT industry and computers for more than a decade and is writing on The Geek Page on topics revolving on windows 10 and softwares.

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