and values approaching the depth of the BRQ queue (16) indicate a system under considerable stress.
•AVG BRQ Latency
This is the average number of cycles that a request resides in the BRQ. It is also useful for interpreting system loading. Large values (> 20 cycles) indicate that the processor is being delayed during bus request arbitration, probably due to excessive bus utilization by a priority agent (I/O).
•AVG IOQ Live Entries Per Cycle
The
•AVG OOQ Live Entries Per Cycle
If a deferred response is received while a request is live in the IOQ, it is moved to the
snoop Event Set
Available only on Itanium 9300
If you use this event set, the default is to make the measurements irrespective of CPU operating state (that is, user, system, or interrupt states). By default, the idle state is not included in the measurement. You can use
•Limit measurement to a specific privilege level:
•Include idle:
•Exclude the interruption state:
•Only measure the interruption state:
Metrics Available from this Measurement
The following metrics are available from this event set. These descriptions do not take into account any
The metrics are:
•Snoops Per Sec
Number of all snoops per second.
•Code
Percentage of snoops that are code snoops.
•Data
Percentage of snoops that are data snoops.
•Inv
Percentage snoops that are invalid snoops.
244 Event Set Descriptions for CPU Metrics