Figure 4: Congestion Window
Size Evolution over Time
This shows the evolution of the congestion window size
over time with and without the remembering mechanism and was done in the
same conditions as Figure 1 – simulating an HTTP
session, no delay – except that tcpdump could
not be used to trace the congestion window size. Instead we took it directly
from within the kernel in the fashion described in section
5.2 which was used to display captured window sizes. The size of the
data sent during each TCP connection was 128 KB in order to increase the
window size significantly in a short period of time. The x-axis is the
time at which a packet was sent. The y-axis is the amount of packets sent
together at that time, which amounts to the congestion window size. The
lower curve shows the behavior of the conventional implementation of TCP
while the upper curve shows what happens when the remembering mechanism
is used.
Back to section 3