Normalizing transaction delay metrics
To create accurate comparisons of the network delay experienced by a transaction, the appliance must analyze packets of the same size (normalized). All other factors being equal, the transaction delays should increase with the amount of data transferred or the transaction size.
To make the APSApplication Perfromance Score score independent of transaction size, the transaction delay metrics are normalized using a constant of 1024 bytes. The normalized network delay is calculated as follows:
Normalized Network Delay = Total Network delay * 1024 / transaction bytes
NOTE
Due to the nature of normalization, protocols that naturally use very small sized packets (like RDP and Citrix) will produce APM values higher than the real ones given such that the results are being multiplied by 1024. The number of bytes used to normalize the calculation of the network delay during a transaction can be configured through the CLICommnad line interface, as well as disabling normalization altogether.
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