How to Enable or Disable the Chimney Offload State in Vista

Information

This will show you how to enable or disable the TCP Chimney Offload State to offload TCP processing for a network connection from the CPU to the network adapter instead. This helps improve the processing of network data on your computer or server without the need for additional programs or any loss to manageability or security. Programs that are currently bound by network processing overhead will generally scale better when used with TCP Chimney Offload. For more information about this, see Information about the TCP Chimney Offload, Receive Side Scaling, and Network Direct Memory Access features in Windows Server 2008 and What is TCP Chimney Offload? - Windows Vista Help. It applies to Vista as well. NOTE   The TCP Chimney Offload State is enabled by default in Vista. It is recommended to have this enabled. You can test to see how your network connection speed works with either setting. Here's How: 1. To See the Current TCP Settings - A) Open a elevated command prompt. NOTE: For how, see: How to Open a Elevated Command Prompt in Vista B) Click on Continue in the UAC prompt. C) In the command prompt, type netsh interface tcp show global and press Enter. (See screenshot below) 2. To Enable the Chimney Offload State - A) In the command prompt, type netsh int tcp set global chimney=enabled and press Enter. (See screenshot below) B) You will get a OK response if successful. If not, repeat step 2A. C) Go to step 4. 3. To Disable the Chimney Offload State - A) In the command prompt, type netsh int tcp set global chimney=disable and press Enter. (See screenshot below) B) You will get a OK response if successful. If not, repeat step 3A. 4. Repeat step 1 to verify the change. 5. Close the command prompt when done.