UserPriorityMapping

HKLM\SOFTWARE\Policies\Microsoft\Windows\Psched

Description

The UserPriorityMapping subkey stores entries that specify an alternate link layer (Layer-2) priority value for service types specified in the per-flow flowspec. The Packet Scheduler inserts the link layer priority value in the Layer-2 priority header of packets. These entries apply only to packets that conform to the flow specification.

This subkey can also contain an entry assigning a default priority value to packets carrying TCP traffic. This entry applies only to TCP packets that are not otherwise classified to a flow.

This subkey stores the entries created when you enable the policies in the Layer-2 priority value folder in Group Policy (Computer Configuration\Administrative Templates\Network\QoS Packet Scheduler). You can use these policy to override the default Layer-2 priority value used for packets of any recognized service type.

• If you enable the policies in the Layer-2 priority value folder, the system adds entries to this subkey with values you specify in the policy.
• If you disable the policies in the Layer-2 priority value folder or do not configure them, Group Policy deletes these entries from the registry and the Packet Scheduler uses the default values.

This subkey also can contain a ServiceTypeTcpTraffic entry that stores the value you enter in the Priority value field of the Specify default marking for TCP traffic Group Policy (Computer Configuration\Administrative Templates\Network\QoS Packet Scheduler). Despite the name of the entry, this policy is not limited to a particular service type. It applies to all TCP traffic that is not otherwise classified to a flow.

• If you enable the Specify default marking for TCP traffic Group Policy, the system adds the ServiceTypeTcpTraffic entry to the registry, and then inserts its value in the Layer-2 header of affected packets.
• If you disable the Specify default marking for TCP traffic Group Policy or do not configure it, Group Policy deletes the ServiceTypeTcpTraffic entry from the registry, and the Packet Scheduler uses the default value of 0.

All entries in this subkey have the following format:

For example, the entry that changes the priority value associated with the Guaranteed service type appears as follows.

The following table shows the priority values assigned when no entries appear in this subkey. ServiceTypeNonConforming applies to all packets that do not conform to the flow specification. ServiceTypeTcpTraffic applies to packets carrying TCP traffic that is not otherwise classified to a flow.

Change method

To change the value of entries in this subkey, use Group Policy.

Note

The policy-related entries in this subkey are not included in the Administrative Template (.adm) files provided with Windows 2000. To use these entries, you must write a policy and then add it to a new or existing .adm file. For instructions, see Advanced topic: Creating custom .adm files in Windows 2000 Server Help.

The entries in this subkey apply to all network adapters on the computer. You can also change the priority values of packets on any particular network adapter by adding entries to the UserPriorityMapping subkey in HKLM\SYSTEM\CurrentControlSet\Services\Psched\Parameters\Adapters\<Adapter-GUID>. If entries appear in the both locations in the registry, the adapter-specific entry takes precedence over the policy when configuring that particular adapter.

Tip

For detailed information about particular Group Policy settings, see the Group Policy Reference (Gp.chm) on the Windows 2000 Resource Kit companion CD.

For general information about Group Policy, see Group Policy in Windows 2000 Help.

To see a table associating policies with their corresponding registry entries, see the Group Policy Reference Table.

Related Entries

UserPriorityMapping (<Adapter-GUID> subkey)