fred64
05-02-2007, 04:42 PM
QoS Bandwidth Reserve Setting
By default, Windows XP reserves 20% of the connection bandwidth for QoS traffic. This tweak allows the setting to be altered to a different percentage of connection bandwidth. If the system uses more than a single adapter for network connections, each adapter may be set individually by navigating to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Psched\Parameters\Adapters\{Adpater-ID}
rather than
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows\Psched
[Start] [Run] [Regedit]
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows\Psched
Modify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: DWORD Value // Value Name: NonBestEffortLimit
Setting for Value Data: [Enter as a Percentage / Default Value = 20]
Exit Registry and Reboot
For a better understanding of QoS, see the link listed below. There have been a number of articles/tweaks published that contain misleading information about performance gains that can be obtained through QoS manipulation. The article below contains the following section:
Correcting Some Incorrect Claims About Windows XP QoS Support
There have been claims in various published technical articles and newsgroup postings that Windows XP always reserves 20 percent of the available bandwidth for QoS. These claims are incorrect. The information in the "Clarification about QoS in End Computers That Are Running Windows XP" section of this article correctly describes the behavior of Windows XP systems.
By default, Windows XP reserves 20% of the connection bandwidth for QoS traffic. This tweak allows the setting to be altered to a different percentage of connection bandwidth. If the system uses more than a single adapter for network connections, each adapter may be set individually by navigating to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Psched\Parameters\Adapters\{Adpater-ID}
rather than
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows\Psched
[Start] [Run] [Regedit]
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows\Psched
Modify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: DWORD Value // Value Name: NonBestEffortLimit
Setting for Value Data: [Enter as a Percentage / Default Value = 20]
Exit Registry and Reboot
For a better understanding of QoS, see the link listed below. There have been a number of articles/tweaks published that contain misleading information about performance gains that can be obtained through QoS manipulation. The article below contains the following section:
Correcting Some Incorrect Claims About Windows XP QoS Support
There have been claims in various published technical articles and newsgroup postings that Windows XP always reserves 20 percent of the available bandwidth for QoS. These claims are incorrect. The information in the "Clarification about QoS in End Computers That Are Running Windows XP" section of this article correctly describes the behavior of Windows XP systems.