We study the signaling cost factors from two aspects: reservation
retry process (or how to recover from reservation blocking), and 
one-pass signaling. Through simulation, we discover that the reservation 
retry mechanism used in RSVP is not only process intensive, but also 
the reservations are slow to converge.  We thus explore several design 
options that can speed up reservation setup and quickly recover from partial
reservations. To gain a better understanding of reservation overhead, we have 
implemented a lightweight one-pass reservation protocol, YESSIR. We show 
that with careful implementation and by using some of basic hashing techniques 
to manage flow states, we can achieve good performance with low processing cost.
Our YESSIR implementation can support up to 10,000 flow setups per second (or
about 300,000 active flows) on a commodity 700\,MHz Pentium PC.