Since last one and half year, I have been working on Windows 7 Operating system and in my experience “Auto Tuning” in windows 7/vista/windows 2008 R2 is the most possible culprit for any network related problems. If you see a network related problem in these operating systems and cannot determine what is the cause, I suggest you try disabling “auto tuning” first.
Windows (Vista/7/8/etc) will automatically set - and more importantly, increase - the size of the TCP receive window for you, as needed, to maximize throughput. Receive Window Auto-Tuning: Microsoft calls this automatic management of the receive window size 'auto-tuning'. To see the settings associated with this, go into a DOS prompt and run. 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.
I know that “auto tuning” is one of the features introduced with windows 7/vista to improve OS operations on network. Basically what it does is, it adjusts the TCP window size to improve the network operations. Though it sounds good in theory, I have seen numerous amount of posts over internet where disabling “auto tuning” addressed many issues like, slow data copy, slowness in email delivery, slow outlook mail caching times, and a few application data transfer related issues. Most of these issues you will see when performing the transfer operations over a WAN link.
So, considering above all, I would like to share the procedure for disabling/enabling “Auto Tuning” in windows 7 environment which may come handy for you in troubleshooting network related issues…
Procedure:
- Open Command prompt with elevated rights
- Run the command netsh interface tcp set global autotuning=disabled
- This disables the auto tuning
- Similar to enable auto tuning back, use the command netsh interface tcp set global autotuningl=normal
Disable Tcp Auto Tuning Windows 10 For Performance
If you want to see the current status of auto tuning, use netsh interface tcp show global
Tcp Auto Tuning Windows 10
Hope this helps you.