Network Performance Criteria
Network Performance Criteria
- - Response Time
- - Throughput (b/s)
- - Normalized throughput
- S = R/C where
- R = Average error free b/s passing through a reference point in the
network
- S = % time the network is carrying error free packets
- - Channel (or link) utilization is the % time the channel (or link is
busy).
- - Channel Efficiency is the % time the channel is carrying user
information.
- Let
- D = # user data bits/packet
- H = # network overhead bits/packet
- then
- Channel efficiency = S(D/(D+H))
- - Channel Capacity, Smax, is the maximum obtainable throughput over the
entire range of input traffic intensities, i.e., offered load.
- - Blocking Probability
- + Packet
- + Call
- - Reliability
Network Performance Perspectives
- - User-Oriented
- + Minimum delay
- + Maximum throughput
- + Highly reliable
- + Very flexible
- + Secure
- - Network Manager
- + Maximum throughput for all users
- + Effective congestion control
- + Easy management
- + Highly reliable
- - Network Designer/developer
- + Simple design
- + Robust
- + Scales
- + Efficient use of resources, CPU, links and memory
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