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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