69
1400
3000
ssl_session
1200
mixed_ssl_session
ssl_bf
2500
1000
mixed_ssl_bf
2000
800
1500
600
Throughput
1000
400
ssl_session
mixed_ssl_session
200
500
Average Request Latency (ms)
ssl_bf
mixed_ssl_bf
0
0
16
14
12
16
14
12
k
Session Period
(a) Latency
(b) Throughput
Fig. 4.10. Latency and Throughput of Homogeneous and Mixed Client Models
The reason why the mixed ssl with bf model shows better latency is that the busy
clients have more requests per session, and thus, the application server can service more
requests with less asymmetric key operations. Since the asymmetric key negotiation
phase is the major performance bottleneck, mixed ssl with bf can yield better perfor 
mance than ssl with bf. mixed ssl with session also has the same advantage, however,
the high skewness due to the busy clients makes imbalance among nodes increasing,
which offsets this advantage.












  

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