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Viewing Offline Performance Summary
Interpreting the Performance Summary Results
Performance Statistics panes
The Performance Statistics pane displays a hierarchical list in which various performance statistics are
categorized in groups and sub-groups.
Clicking a group or category in this pane displays the link-wise statistics for associated performance
parameters. The following table briefly describes the performance statistics displayed for categories.
Category
Performance Statistics Displayed
Flow Control
Tracks and computes the available flow control credits for a bidirectional data trace and helps in analyzing the flow of data. To
know more refer to the topic "Flow Control.
Bus Statistics
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Transaction Performance
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Some important points while viewing and interpreting performance summary:
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Bandwidth (GBits/s): Shows the number of non- idle symbol bits transferred per second.
Data Throughput (MBytes/s): Shows the number of TLP payload bytes transferred per second.
Payload Length (DWords): Shows the minimum, maximum, as well as average payload size for TLPs.
TLP Count (TLPs/s): Shows the number of TLPs transferred per second.
Link Efficiency (%): Shows the efficiency of the link. It is calculated as Symbol time for payload / (Symbol time for all DLLP +
Symbol time for all TLP + Symbol time for OS).
Link Utilization (%): Shows the percentage of non- idle symbols in total number of symbols transferred.
TLP Utilization (%): Shows the percentage of TLP symbols in total number of symbols transferred.
Non- Posted Transactions: Shows the minimum, maximum, and average values of the following performance parameters for
all non- posted transactions.
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Response Time (ns): It is same as the duration of the transaction.
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Latency (us): It is the time duration between the end of a request transaction and the arrival of its first completion.
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Throughput (MBytes/s): It is the length of complete data divided by the response time.
Posted Transactions: Shows the minimum, maximum, and average values of the following performance parameters for all
posted transactions.
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Response Time (ns): It is same as the duration of the transaction.
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Throughput (MBytes/s): It is the length of complete data divided by the response time.
A --.-- value displayed in a statistics tree/table for a performance parameter indicates that the
packet(s) required to generate that statistics is not found in the trace. It signifies 'no data' received
for generating the statistics. Consequently, the chart corresponding to such a performance
parameter contains no data and is therefore not displayed in the charts pane. Such a chart gets
displayed only when the required packets are found while computing performance summary to
generate data for the chart.
Keysight U4301 PCIe Gen3 Analyzer User's Guide
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