65
Table 4.3.
Normalized Utilization and Standard Deviation of ssl with session to that
of ssl with bf
16 node
32 node
Normalized utilization
0.80
0.77
Normalized Standard deviation
3.9
4
Now, let us analyze more realistic scenarios. In the previous experiments, we
assume that the session information of the clients does not expire in the distributor, and
it can forward all the subsequent requests from the same client correctly. However, this
assumption may not be realistic since the session information of a client expires after
the configuration time. If the distributor should keep the client's session information for
a long period, the maintenance of the session information may offset the performance.
Thus, to estimate the minimum time period, which still yields good performance, we
performed experiments by varying the session period of the distributor. Note that the
session period mentioned here is the session configuration in the distributor, not in the
application server. An application server maintains the actual session information such
as the session ID and the master secret key of the old or existing sessions during the
configuration time. But the distributor only keeps the corresponding server name of a
client of the previous or existing connection to make the Web server reuse the session
information.
Figure 4.8 depicts the latency and throughput results of ssl with session and
ssl with bf. Two models are tested with difference server loads, high load (k=12) and
moderate load (k=14). The X axis in Figure 4.8 is the session period of the distributor,












  

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