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Best practice analyser report shows: Receive Window Auto-Tuning Level

Posted on 2010-11-12
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Last Modified: 2012-05-10
Can anyone explain in lamens terms what this means? should i action this or just leave it?

Receive Window Auto-Tuning Level

Receive Window Auto-Tuning Level is set to normal. To disable Receive Window Auto-Tuning Level, click Start, and in
the Search box type "command." in the results, right-click Command Prompt, and then click Run as administrator. At
the command prompt, run the following command:
netsh int tcp set global autotuning=disabled
For more information, see:
Information about the TCP Chimney Offload, Receive Side Scaling, and Network Direct Memory Access features in
Windows Server 2008
http://go.microsoft.com/fwlink/?LinkId=189029
Mail flow to certain domains does not work when you run Exchange Server 2007 on a Windows Server 2008-based
computer
http://go.microsoft.com/fwlink/?LinkId=189028
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Question by:resolver1
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Rob Williams earned 500 total points
ID: 34120661
Similar to my response in your other question (below) there are several new features in the NIC advanced configuration. These are intended to improve performance but many NIC's do not support the features and end up affecting performance very negatively. As a result most have found disabling these has no ill affects, and in most cases makes a great improvement in accessing server resources. The BPA will usually recommend disabling these features, and it is collectively agreed this is the case.
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There are some known issues with advanced NIC properties such as "large send offload", "Checksum offload", and "Receive-Side Scaling" which drastically affect performance of file share access if enabled and especially if you are running older drivers. Running the SBS Best Practices Analyzer will usually recommend disabling these. If new drivers are available they may make use of these features, otherwise they should be disabled.

http://blogs.technet.com/b/networking/archive/2008/11/14/the-effect-of-tcp-chimney-offload-on-viewing-network-traffic.aspx
http://blogs.dirteam.com/blogs/sanderberkouwer/archive/2008/05/15/backward-compatible-networking-with-server-core.aspx
http://support.microsoft.com/kb/951037
http://msmvps.com/blogs/thenakedmvp/archive/2010/02/23/rss-tcp-offloading-strikes-again-microsoft-should-kill-this-feature-for-the-masses.aspx
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Author Comment

by:resolver1
ID: 34147111
Thanks for the info.  Disabled.
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LVL 77

Expert Comment

by:Rob Williams
ID: 34147240
Thanks resolver1.
Cheers!
--Rob
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