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\Services\Psched\Parameters\Adapters\{Adpater-ID}
rather than HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Psched
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[Start] [Run] [Regedit]
Registry Key:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\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
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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.
Windows XP Quality of Service (QoS) Enhancements and Behavior
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