DiffServByteMappingConforming

HKLM\SYSTEM\CurrentControlSet\Services\Psched\Parameters\Adapters\<Adapter-GUID>\

Description

The DiffServByteMappingConforming subkey stores entries that specify an alternate Differentiated Services Code Point (DSCP) value for service types specified in the per-flow flowspec. The Packet Scheduler inserts the corresponding DSCP value in the IP header of the packets. These entries only to packets that conform to the flow specification.

This subkey can also contain an entry, ServiceTypeTcpTraffic, that assigns a default DSCP value to packets carrying TCP traffic. Despite its name, this entry does not pertain to packets of any particular service type. This entry applies only to TCP packets that have not otherwise been classified to a flow.

The DiffServByteMappingConforming subkey does not appear by default, but you can add it to the registry to override the default DSCP value for unclassified TCP traffic or for packets of any recognized service type.

All entries in this subkey must have the following format:

Entry name Data type Value
<Service-type> REG_DWORD 0x0 - 0x3F

For example, to change the DSCP value associated with the Guaranteed service type, add the DiffServByteMappingConforming subkey, then add the following entry to the DiffServByteMappingConforming subkey.

Entry name Data type Value
ServiceTypeGuaranteed REG_DWORD 0x20

The following table shows the DSCP value used when no entries appear in this subkey.

Service type Default DSCP value
ServiceTypeBestEffort 0x00
ServiceTypeControlledLoad 0x18
ServiceTypeGuaranteed 0x28
ServiceTypeNetworkControl 0x30
ServiceTypeQualitative 0x00
ServiceTypeTcpTraffic 0x00

Note Image Note

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

The entries in this subkey take precedence over Group Policies that apply to packets carried by all network adapters on this computer. For more information, see DiffServByteMappingConforming (Policies subkey).

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