RFC6349 MetricsRFC6349 Metrics
Transfer Time RatioTransfer Time Ratio
TCP EfficiencyTCP Efficiency
Buffer DelayBuffer Delay
66..1010..33..22 RFC 6349 MetricsRFC 6349 Metrics
RFC 6349 defines three metrics.
Transfer Time RatioTransfer Time Ratio
Defined as below:
TCP Transfer Time Ratio =
Actual TCP Transfer Time
Ideal TCP Transfer Time
Ideal TCP Transfer Time is calculated from bit rate, MTU and TCP payload
bytes. The Maximum Transmission Unit (MTU) is obtained from Path MTU test.
TCP EfficiencyTCP Efficiency
TCP Efficiency is the ratio of transmitted bytes without retransmission in
transmitted total bytes. Defined as below:
TCP Efficiency (%) =
Transmitted Bytes - Retransmitted Bytes
× 100
Transmitted Bytes
If 100 000 bytes were sent, and 2 000 had to be retransmitted, the TCP
Efficiency percentage would be calculated as:
TCP Efficiency (%) =
102000 - 2000
× 100 = 98.03
102000
Buffer DelayBuffer Delay
Buffer Delay shows the ratio of increased RTT against baseline RTT. Defined as
below:
Average RTT during transfer =
Total RTTs during transfer
Transfer durations in seconds
Buffer Delay (%) =
Average RTT during transfer - Baseline RTT
× 100
Baseline RTT
For example, a baseline RTT of network path is 25 ms, and average RTT across
the entire transfer increases to 32 ms. Buffer Delay percentage would be
calculated as:
Buffer Delay (%) =
32 - 25
× 100 = 28
25
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