Summary: Review of Explicit Allocation of Best-Effort Packet Delivery
March 26, 2007
This paper proposed a preferential dropping algorithm and a tagging algorithm. The proposed
twin RIO algorithms use two sets of parameters, one set for in packets and one for out packets. As
in RED, RIO has three phases to determine dropping in the routers, normal operation, congestion
avoidance and congestion control. The paper designed a TSW tagger, which is a profile meter
for bulk-data transfer. The tagger estimates the TCP sending rate and based on this, a tagging
algorithm tags packets as out when the traffic exceeds a certain threshold.
In the receiver-based scheme, the routers only mark the packets by setting the ECN bit and rely on
the end host to back off. This scheme depends on well-behaved TCP for the sender to slow down
Another thing is that the proposed allocated-capacity framework seems to depend on the ver-
sion of TCP. Simulation results shows that it can achieve different throughput with high assurance
with newer version of TCP. The framework also needs to be tested by real internet.
Although today's internet works, it is valuable if different services could be provided to satisfy