TCP Vegas and BBR

TCP Vegas and BBR

indicator 1 that queue is building in the network

increasing RTTs

indicator 2 that queue is building in the network

flattened sending rate

TCP Vegas is based on which principle?

queues building are causing the sending rate to flatten

BaseRTT calculation

RTT of first packet sent

expected sending rate calculation

congestionWindow / BaseRTT

actual sending rate calculation

number of bytes sent in each RTT

rate difference calculation

expected rate - actual rate

condition 1

if rateDifference < alpha, congestion window is increased linearly

condition 2

if rateDifference > beta, congestion window is decreased linearly

goal for setting alpha and beta 1

ensure that the congestion window is reduced when it is likely queues are building in the network

goal for setting alpha and beta 2

ensure host is responsive to increases in capacity

bbr

bottleneck bandwidth and RTT

packet pacing

estimating the BBR to compute the rate at which packets are sent within each RTT such that they are evenly spread out