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Table 2 Online evaluation metrics

From: SAViNE: social network analysis - inspired content delivery network deployment and experimentation

Response time User-perceived service response time.
Throughput Surrogate throughput measured on the
  server wireless interfaces.
CPU load The average load of the surrogate server
  aggregated over a pre-specified time window.
Cache hit ratio The ratio of the number of times
  that content is served from the cache to
  the number of requests for content.
Client requests per The average number of connected clients
surrogate per surrogate.
Average distance per The average distance of the connected clients
surrogate from the surrogate.
SNR Signal-to-noise ratio is a relative measure of
  the received signal power compared to the noise
  power in the wireless channel.