Tcp Receive Window Auto-tuning Windows 2012 R2

Starting with Windows Vista, there were improvements made to the network stack including a little known feature called TCP Window Auto-tuning. The auto-tuning feature allows newer versions of Windows to be able to adjust the RWIN value automatically on the fly so to speak. While it does offer improvements in certain realms, it can also cause network performance issues. I wanted to detail a few scenarios of TCP Auto-tuning slow network performance and when I have observed this issue come into play

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  1. Receive Window Auto Tuning Level
  2. Tcp Receive Window Auto-tuning Windows 2012 R2 Edition
  3. Tcp Window Size Windows

You can see your current TCP Auto-tuning values by issuing the NETSH command: Oj da juiceman i cook mp3 download.

Apr 14, 2020  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. I've got 2 windows 2012 servers that limit connection speed to anywhere from 1-3mBps and it seems to be related to tcp window scaling. Both servers have these settings TCP Global Parameters -. Sep 30, 2014  Server 2012 R2, TCP/IP has chosen to restrict the congestion window. Windows Server. Windows Server 2012 General https. Receive Window Auto-tuning level - normal. Add-on congestion control provider - none. ECN capability - enabled. RFC 1323 timestamps - disabled. Apr 07, 2020  How to change TCP window size in windows 2012 server Hi All, We need to improve low throughput (data download from one server to another server) and hope this can be achieved by using Jumbo Frames or increasing the TCP Window Size. TCP/IP is the backbone for Microsoft Windows networks. It is required for internetwork communications and for accessing the Internet. Before you can implement TCP/IP networking, you should understand IP addressing conventions, subnetting options, and name-resolution techniques—all of which are covered in this chapter from Windows Server 2012 R2 Inside Out: Services, Security.

It will display something similar to the following (the following clip is taken from a Windows 10 workstation):

If you notice above, the line Receive Window Auto-Tuning Level is set to normal. This is the default setting out of the box.

Receive Window Auto Tuning Level

To turn off TCP Auto-tuning you can use the following command:

Another option is to set TCP Auto-tuning to highlyrestricted which seems to have the same performance improving effect as disabling when connecting to legacy OS versions.

TCP Auto-tuning slow network performance

For the most part, I have seen the TCP Auto-tuning slow network performance issue come into play with new server OS’es and client OS’es talking to legacy server OS’es like Windows Server 2003. Especially in file copies, RDP sessions and SQL query performance the issue has been evident.

Slow File copy and RDP performance

In particular I have seen many cases where the file copies from newer operating systems to slower operating systems and back have been super slow. Recently, in an environment still running a Windows 2003 server, RDP from Windows 10 was horribly slow. The experience was one of the mouse freezing every 5 seconds or so for 2 or 3 seconds then it would release and keep doing that – basically an unusable state.

Slow SQL query performance

Recently, in working with a developer who was running queries from Windows 2012 R2 server running SQL 2012, he had horrible query performance querying data from an old Windows 2003 server running SQL 2005. You may be saying to yourself, Windows 2003 and SQL 2005 are not supported any longer, why would anyone be running those operating systems still? Sad to say, they are still out there in greater numbers than we would like to think, mainly due to legacy applications that are bound in some way to an older version of SQL/Windows for whatever reason.

Case in point, the query performance you see in the first screenshot is taken with the auto-tuning levels set at default. Notice the msDur value in the first query. These values are connecting back to a legacy Windows 2003 server.

Tcp Receive Window Auto-tuning Windows 2012 R2 Edition

Now, the following screen clip is taken showing the query performance after turning auto-tuning off. Also, these values are connecting between sites so this is why they are still showing as much higher than the other query results you see.

Final Thoughts

Tcp Window Size Windows

If you are chasing a weird network performance issue that seems to have no other explainable cause, you may want to check into your TCP Auto-tuning settings. The TCP Auto-tuning slow network performance issue can be a difficult issue to track down especially since it is usually the last thing we think to look at. If you have a mix of legacy OS and new OS versions in your environment, it is a good bet you may want to focus on and test various settings with Auto-tuning to rule out any potential issues with network performance.