Fabric Manager Users Guide, Version 6.1, Revision A - QLogic

2–Advanced Fabric Manager Capabilities
Performance Manager
Histogram Data
• XmitWaitCongestionPct10 – Percentage of time that the outgoing port was
congested and unable to transmit. This value is only available for QLogic
Host Channel Adapters and requires that PmaCaVendorEnable to be
enabled. This is expressed as an integer*10. So for example 100% is
reported as 1,000.
• XmitWaitInefficiencyPct10 – Percentage of time that the outgoing port was
congested when it could have been transmitting. Computed as
XmitWaitCongestionPct/(XmitWaitCongestionPct+Utilization%). This value
is only available for QLogic Host Channel Adapters. This is expressed as an
integer*10. So for example 100% is reported as 1,000.
The default configuration combines XmitDiscard, XmitInefficiencyPct10, and
XmitWaitInefficiencyPct10 with XmitDiscard heavily weighted such that any
packet discards are weighted higher than inefficiencies. The default threshold of
100 represents 10% inefficiency and/or any packet loss due to extreme
congestion.
It is left to the user to decide if the use of XmitCongestionPct10 and
XmitWaitCongestionPct10 is of more interest for the given fabric. Typically
XmitInefficiencyPct10 and XmitWaitInefficiencyPct10 will report a value higher
than XmitCongestionPct10 and XmitWaitCongestionPct10.
For each condition a histogram is tracked. Each histogram has a set of buckets
which count the number of ports in a given group with a certain range of
performance/errors.
For Bandwidth, ten histogram buckets are tracked, each 10% wide. The buckets
each count how many ports in a given group had this level of utilization relative to
wire speed.
For Errors (Integrity, Congestion, SmaCongestion, Security, Routing), five
histogram buckets are tracked. The first four are 25% wide and indicate the ports
whose error value is the given percentage of the configured threshold. The fifth
bucket counts the number of ports whose error rate exceeded the threshold. The
overall summary error status for a given group is based on the highest error rate
for any port tabulated by the group.
Support for iba_report
In addition to tracking interval counters, the PM also keeps one set of long running
counters per PMA. These counters will be accessed by iba_report and provide
compatible support for existing iba_report error analysis and other FastFabric
tools, such as fabric_analysis and all_analysis.
As such, when the PM is running, iba_report will access data from the PM,
therefore options such as -o errors and -C will access PM internal copies of PMA
counters and will not affect the actual hardware PMA counters.
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