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New registry entry for controlling the TCP Acknowledgment (ACK) behavior in Windows XP and in Windows Server 2003
Article ID: 328890 - View products that this article applies to.
This article was previously published under Q328890
TcpAckFrequencyis a new registry entry in Microsoft Windows XP and Microsoft Windows Server 2003 that determines the number of TCP acknowledgments (ACKs) that will be outstanding before the delayed ACK timer is ignored.
As specified in RFC 1122, TCP uses delayed acknowledgments to reduce the number of packets that are sent on the media. Instead of sending an acknowledgment for each TCP segment received, TCP in Windows 2000 and later takes a common approach to implementing delayed acknowledgments. As data is received by TCP on a particular connection, it sends an acknowledgment back only if one of the following conditions is true:
Important Before you edit this registry entry, you must first install the hotfix that is described in the following article:
(http://support.microsoft.com/kb/815230/ )Changing the TcpAckFrequency value to 1 does not have any effect
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Subkey:If you set the value to 1, every packet is acknowledged immediately because there is only one outstanding TCP ACK as a segment is just received. The value of 0 (zero) is not valid and is treated as the default, 2. The only time the ACK number is 0 is when a segment is not received and the host is not going to acknowledge the data.
Value Type: REG_DWORD, number
Valid Range: 0-255
Description: Specifies the number of ACKs that will be outstanding before the delayed ACK timer is ignored. Microsoft does not recommend changing the default value without careful study of the environment. For more information, visit the following Microsoft Web page:
Article ID: 328890 - Last Review: February 28, 2007 - Revision: 4.5