To generate diagnostic logging of the Quality of Service (QoS) service, use Regedt32 to navigate to:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rsvp\Parameters

On the Edit menu, Add Value name EnableDebugAid, as a type REG_DWORD.

A data value of 0 generates %SystemRoot%\System32\Logfiles\Qossp.aid, which contains information on how a program is using the QoS API. A data value of 1 generates %SystemRoot%\System32\Logfiles\Rapilib.aid, which contains data about how well the QoS service provider is working.