KB 949316 - Add Compound TCP (CTCP) support to XP and Server 2003

A hotfix is available to add Compound TCP (CTCP) support to computers that are running Windows Server 2003 or Windows XP. CTCP aggressively adjusts the congestion window of the sender to optimize TCP for connections with large bandwidth-delay products. These products include Video on Demand for Windows Server 2003 and for Windows XP.

Note: CTCP support was introduced in Windows Vista and in Windows Server 2008.
Personal note: I'll be adding this to my XP VMs, 2003 VMs, and standalone machines that are at home because CTCP has proven to be a win, performance wise, for my Internet connection.

Once the hotfix is applied, ensure CTCP is enabled by checking the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TCPCongestionControl. It should be set to 1 as a DWORD to enable.

Posted by Aaron Tiensivu in Microsoft, Server, Vista, Windows OS at 14:21 | Comments (4) | Trackbacks (0)

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Any idea if this will be a component of XP SP3? The Microsoft website doesn't specify.

#1 Leslie Smith on 2008-03-20 02:58 (Reply)

Hey the KB949316 doesn't seem to be for 32-bit XP??

#2 anonymous on 2008-03-20 05:53 (Reply)

I think you are right. It seems to be only available for Windows 2003 x86 and x64, and Windows XP x64. This makes sense, to a certain extent, because Windows XP x64 and Windows 2003 x64 share/shared the same kernel for the most part. I have a question into the XP SP3 group on whether or not it will trickle down to XP x86. I hope so, because that is 99% of my XP VMs.

#2.1 Aaron Tiensivu (Homepage) on 2008-03-20 12:48 (Reply)

Hello!

Inside the above hotfix the build of
tcpip.sys is 4241 (5.2.3790.4241).

But there is v2 of KB947775 with
even newer build 4246 (5.2.3790.4246)

Regards, Roman

(1) http://support.microsoft.com/kb/947775
(2) http://www.microsoft.com/whdc/device/network/TCP_Chimney.mspx

#3 doknir (Homepage) on 2008-03-24 06:56 (Reply)

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