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Procedure for raising network limits for Windows XP (and Windows 2000)
The easiest way to tune TCP under Windows XP (and many earlier versions of windows) is to get DrTCP from "DSL Reports" [download page]. Set the "Tcp receive window" to your computed BDP (e.g. 400000), turn on "Window Scaling" and "Selective Acks". If you expect to use 90 Mb/s or faster, you should also turn on "Time Stamping". You must restart for the changes to take effect.
If you need to get down in the details, you have to use the 'regedit' utility to read and set system parameters. If you are not familiar with regedit you may want to follow the step-by-step instructions [here].
BEWARE: Mistakes with regedit can have very serious consequences that are difficult to correct. You are strongly encouraged to backup the entire registry before you start (use the backup utility) and to export the Tcpip\Parameter subtree to a file, so you can put things back if you need to (use "export" under regedit).
The primary TCP tuning parameters appear in the registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters.
To enable high performance TCP you must turn on RFC1323 features (create REG_DWORD key "Tcp1323Opts" with value 3) and set the maximum TCP buffersize (create REG_DWORD key "GlobalMaxTcpWindowSize" with an appropriate value such as 4000000, decimal).
If you want to set the system wide default buffer size create REG_DWORD key "TcpWindowSize" with an appropriate value. This parameter can also be set per interface at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interface\interfaceGUID, which may help to protect interactive applications that are using different interfaces from the effects of overbuffering.
For the most up to date detailed technical information, go to the Microsoft knowledge base (at support.microsoft.com) and search product "windows XP" for "TCP/IP performance tuning".
Speedguide summarizes this material with an intermediate level of detail, however the target audience is for relatively low data rates.
There is also very good page on tuning Windows XP, by Carl Harris at Virginia Tech.
Contributors: Jim Miller (at PSC).
Checked for WindowsXP service pack 2, July 2006
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ที่มา :
http://www.psc.edu/networking/projects/tcptune/
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