Jan 20, 2019 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.
Send Us a Sign! (Contact Us!)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:
netsh interface tcp show global |
If you see normal written against Receive Window Auto-Tuning Level, it means that the feature is enabled and it is dinamically modifying the size of RWIN (Receive WINdow of TCP) based on network traffic.
To disable Windows AutoTuning, run the following command:
netsh int tcp set global autotuninglevel=disabled |
To enable Windows AutoTuning, run the following command:
netsh int tcp set global autotuninglevel=normal |
You can also tweak the Windows Registry. 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.
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.
Here is How to Fix The Situation
Microsoft’s Windows 10 operating system has been mired in controversy almost since its public unveiling a little over a year ago. First, Microsoft drew criticism because of the “forced” nature of the updates. Whether a user explicitly wanted them or not, update files often downloaded without a user’s express permission and could even automatically install themselves under certain conditions. Now, thanks to the recently released Windows 10 anniversary update, a certain feature that is enabled by default could potentially be slowing a person’s computer down without them realizing that they have a problem in the first place.
Window Auto Tuning
Like much of the Windows 10 operating system, the Window Auto Tuning feature built into the software was created with only the best of intentions. It’s actually a modern version of a feature that has been around since the days of Windows Vista that is designed to improve the way that certain programs perform when sending TCP data over a network connection. The issue is that the default configuration options used by the feature (which itself automatically runs by default) are NOT optimized for every type of connection out there.
If you’ve recently updated your computer to Windows 10 and feel that your Internet speeds are slower than normal or are generally more sluggish than you’d like, there is a very high chance that this feature is why. Luckily, it’s a problem with a relatively straightforward solution.
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Disabling Window Auto-Tuning
Those who wish to disable Window Auto Tuning and regain some of their lost Internet connection speed can do so using the command prompt. From the desktop, hold the “Windows” key on your keyboard and open the command prompt by typing “cmd.exe” into the box that appears. Hold down the “Shift” and “CTRL” keys on the keyboard, tap the “Enter” key and click “Yes” on the UAC prompt that opens.
Type the command “netsh interface tcp show global” into the command prompt box (without quotation marks) to view the configuration options of the computer in question. If the option “Receive Window Auto Tuning Level” has a setting of “normal” next to it, the Window Auto Tuning Feature is currently enabled.
To disable the feature, type the command “netsh int tcp set global autotuninglevel=disabled” into the box on screen (without quotation marks) and hit “Enter” on your computer’s keyboard. The Window Auto Tuning feature will now be disabled.
To verify that this was the cause of your slow Internet connection problems, visit a site like SpeedTest.net and run a speed test on your Internet service provider’s connection. If your speed test ranks higher than it has in the past, or if you notice that your computer is generally faster as you go about your business, congratulations – you just solved your problem.
If Window Auto Tuning was NOT the reason you were experiencing slow connection speeds, don’t worry – you can always turn it back on.
Return to the command prompt box and type the command “netsh int tcp set global autotuninglevel=normal” (without quotation marks). Hit the “Enter” key on your keyboard once again to turn the feature back on. You’ll also likely want to experiment with additional settings on your computer that could be causing your Internet speeds to dip below the upload and download rates that you’re paying for from your Internet service provider.
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