43b7af74_vices_List___Overclockers_Club__Notes
[Service Name] QoS RSVP [Recommended Setting] Disable [Notes] 
Resource Reservation Protocol (RSVP) is an IETF-draft networking protocol dedicated to being the facilitator and carrier of standardized QOS information and parameters. RSVP carries generic (industry-defined) QOS parameters from end nodes (inclusive) to each QOS-aware network device included in the path between RSVP session members. That is, RSVP is a means by which end nodes and network devices can communicate and negotiate QOS parameters and network usage admission. I recommend disabling this service as it uses resources and it is also a known fact that is can cut your bandwidth speed by 20% for it's own use.
Windows XP Services Removal Guide » Page 2 - Windows Services List - Overclockers Club
Notes