To speed up the internet, you can disable the feature. Receive Window Auto Tuning Level Windows 10 Step 1: Press Win + R to open Run window. Then type cmd in the box and press Ctrl + Shift + Enter to run command prompt as administrator. Netsh interface tcp set global autotuning=restricted. If that doesn’t help the simplest way to turn off auto-tuning is to enter the following line: netsh interface tcp set global autotuning=disable. That should do it, and turning it off won’t likely have any adverse consequences. You should notice the difference in browsing speeds immediately. Disabling auto tuning of TCP Windows Size should not cause any negative effects, only that TCP Window Size will always at default value without ability to optimization to each connection. Anyway, if there is any side effect after turn off auto tuning, simply re-enable back it. Aug 17, 2016 How to disable ‘Window Auto-Tuning’ on Windows 10 Use the Windows key + X keyboard shortcut to open the Power User menu and select Command Prompt (Admin). Type the following command and press Enter: netsh int tcp set global autotuninglevel=disabled. Nov 21, 2012 I assume that Win7 has done some sort of 'tuning' and decided to delay the receive data hoping that more will arrive and fill up the input buffer.

It's more likely you're going to implement your Server Core boxes inside a legacy environment, than implement them inside a new Windows Vista, Windows Server 2008 only environment.

I'll try to explain the 'Next Generation IP Stack' which was introduced with Windows Vista and is also present in Windows Server 2008, both in Full and Server Core installations. I'll show you how to tweak down some default global TCP settings, that are part of what Microsoft calls the 'Scalable Network Initiative'.

Tweaking down will ensure you can access your Server Core boxes without delays from Windows 2000, Windows XP and Windows Server 2003.

The stuff in this post will also be very useful when you deploy Server Core inside a networking environment based on 100Mb/s (or slower) infrastructure, since most of the default tweaks in the 'Scalable Network Initiative' assume you have a Gigabit Network Interface Controller.

Disable Windows Auto Tuning

Note:
For copper-based Network Interface Controllers Windows Server 2008 ships with Gigabit Network Interface Controller drivers only. When you want to use your 10Mb/s or 100Mb/s Network Interface Controllers with Windows Server 2008 you need to manually add drivers.

The default settings for the Transmission Control Protocol (TCP) part of TCP-IP are easily readable in Server Core installations of Windows Server 2008.

The command to use is:

netsh interface tcp show global

This will show you the settings for:

Parameter	Default value
Receive-Side Scaling State	enabled
Chimney Offload State	enabled
Receive Window Auto-Tuning Level	normal
Add-On Congestion Control Provider	ctcp
ECN Capability	disabled
RFC1323 Timestamps	disabled

Receive-Side Scaling is a technology which allows a Windows Vista and later Microsoft Operating Systems to utilize multiple processors to handle the network stack. Technically it allows large file transmissions to be processed in a parallel manner. Packets are balanced between your processors (or cores) through the use of a software hash codes and hardware hash codes for each connection.

The origin or Receive-Side Scaling

In our multi-core and even multi-processor systems not having Receive-Side Scaling might mean one processor would be utilizing 100% CPU, while the other would be virtually doing nothing. In the case of a File Server you might want both processors to be used and the load to be balanced.

The problem with Receive-Side Scaling

Should I Disable Receive Window Autotuning

The problem with Receive-Side Scaling is it's susceptible to packets that were changed before they were received. The hashes don't match in that case and the connection is dropped. Microsoft acknowledges this is a problem when NAT, ICS, ISA Server or other firewall products are used. If your anti-virus software includes a firewall (and most do) this might present a problem.

How to turn off Receive-Side Scaling

Using the command line

To turn off Receive Side Scaling on your Server Core installation of Windows Server 2008 simply type the following command:

netsh interface tcp set global rss=disabled

Using the registry

Alternatively you can edit the settings for Receive-Side Scaling in the registry, although this will require a reboot, since the values to modify exist or need to exist in the following place in the registry:

HKLMSYSTEMCurrentControlSetServicesTcpipParameters

By default you wouldn't find a REG_DWORD value for EnableRSS in this registry key. If you want to disable Receive-Side Scaling though, you need to create it manually. After you created the new value you can set the data to 0, which means disabled. If the value is not present, create it. If you decide to enable it afterwards you can change the value to 1, which meant enabled.

For more information on Receive-Side Scaling please read the Scalable Networking with RSS Whitepaper on the Microsoft Website.

TCP-IP Chimney Offloading is a pretty neat technology that takes advantage of the current generation (Gigabit) Network Interface Controllers that have been equipped with a TCP Offload Engine (TOE). These Network Interface Cards are capable of managing connections and traffic on their own. By offloading a lot of calculations of this traffic from the CPU to the Network Interface Card (NIC) you can use your CPU to calculate other things.

The word chimney is derived from the Chimney Architecture and finds its origin in the (OSI) Stack. The purpose of the chimney is to isolate traffic between the top and the bottom of the chimney. Vents in the chimney (that is, special function calls for manipulating the offloaded control plane) allow the host stack to query, update, invalidate, and terminate the offload state.

Microsoft has acknowledged some problems with Chimney Offloading.

How to turn off Chimney Offloading

Using the command line

Gamehouse download for pc. If you don't have a Network Interface Card with a TCP Offload Engine (TOE) or just want to ensure proper network traffic flow you can disable TCP Chimney Offloading using the following command:

netsh interface tcp set global chimney=disabled

Using the registry

To disable Chimney Offloading using the registry you can browse to the following key:

HKLMSYSTEMCurrentControlSetServicesTcpipParameters

You should see a REG_DWORD registry value named EnableTCPChimney. The data for this registry entry would read 1 by default, which would mean enabled. To disable TCP Chimney Offloading change the data to 0, which resembles disabled. If the value is not present, create it.

You need to reboot your Server Core box to make your registry changes take effect.

When you have a broad network connection you might want to use it efficiently and that is exactly what the IETF had in mind when they worked on RFC 1323 back in 1992. One of the new things in RFC 1323 is Receive Window Auto-Tuning, which allows the receiving end of a TCP connection to advertise a larger 'window' in TCP-IP packets to transmit data in. This allows for a higher percentage of data in relation to headers in TCP-IP packets, increas

Should I Disable Receive Window Autotuning