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Configuring and Computing Offline Performance Summary
Before you Start
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Computing Offline Performance Summary
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NOTE
Keysight U4301 PCIe Gen3 Analyzer User's Guide
You should have purchased and installed the Offline Performance Summary license for computing
performance summary.
On purchasing the license, you receive an entitlement certificate. Follow the instructions in this
certificate to install the license.
Ensure that the data in the required direction(s) is already captured and available in the Logic and
Protocol Analyzer GUI for performance summary computation. You may save the captured data in
a Logic Analyzer configuration (.ala) file and access this data offline for performance summary
computation.
Click the Performance Overview tab in the Protocol Viewer window.
In the Data Range groupbox, specify the start and end points of the captured PCIe data for which
you want to compute performance summary. Only the specified range of data is analyzed to
compute performance. Following options are available for setting this data range.
• Beginning and End of data - This data range selection ensures that performance summary is
computed for the entire trace.
• Begin Extent and End Extent - The Extent markers indicate the pan/zoom extents.The software
automatically places extent markers on the beginning and end of the current pan/zoom
extents defined in charts. When you change the pan/zoom extents in charts, the extent
markers are automatically moved to changed extents.
• Trigger - Selecting Trigger in the data range ensures that performance summary is computed
from the point where the U4301 module's trigger condition was met.
• Markers - Selecting markers in the data range ensures that performance summary is computed
for the specific portion of PCIe traffic defined by markers. Refer to "Defining Markers for Setting the
Computation Range" on page 162 to know more.
For generating performance statistics, only complete transactions from the captured trace are
used. Select the Assume ACK checkbox to instruct the software to assume ACKs for the
transactions in which only ACK is missing. Assuming ACKs, therefore ensures that the
transactions with missing ACK are considered complete and used in performance summary
computation. You may want to use this Assume ACK option in situations such as when you have
filtered ACKs while data capture to make more memory available to TLPs.
Click the Compute button displayed with the Data Range fields.
Compute This and Compute All are the two options available with the Compute button.
- Compute All allows you to compute traffic overview statistics, decoded transactions, offline
performance summary, and LTSSM states (in their respective tabs) for the captured packets
by a single click of this button.
- Compute This allows you to compute only performance summary from the captured
packets. When you click Compute, then also only performance summary are computed.
Viewing Offline Performance Summary
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