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 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 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
6.10.3.3 Window Scan
Touching the Window Scan button in the navigation area will display the
screen shown below.
This screen presents the results from the Window Scan test. The ideal
throughput and the actual throughput are shown in the chart. If touching on
the Graph bars, step details appear in the right hand table.
6.10.3.4 Throughput
Touching the Throughput button in the navigation area will display the
screen shown below.
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