HP Caliper User Guide Release 5.5 (5900-2351, August 2012)

◦ Wrong Path
Percentage of Indirect branches for which the target path (taken/not-taken) was predicted
incorrectly.
◦ Wrong Target
Percentage of Indirect branches for which the target address was predicted incorrectly.
• Return
This metric provides the branch prediction outcome breakdown (correct, wrong path, wrong
target) for return branches. Predicated off returns that are predicted as taken will be counted
as wrong path outcomes.
◦ Weight
Fraction of Return branches amongst all branch types.
◦ Correct
Percentage of correctly predicted Return branches.
◦ Wrong Path
Percentage of Return branches for which the target path (taken/not-taken) was predicted
incorrectly.
◦ Wrong Target
Percentage of Return branches for which the target address was predicted incorrectly.
c2c Event Set
Available only on Itanium 2 and dual-core Itanium 2 systems.
The c2c (“cache-to-cache”) event set provides information relating to cache coherence activity
from the local processor perspective, the source of data for local data cache misses, and rate at
which the local processor satisfies the data cache miss of remote processors.
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 command-line options to limit the scope of the measurement. Specifically,
you can:
• Limit measurement to a specific privilege level: -m event_set[:all|user|kernel]
• Include idle: --exclude-idle False
• Exclude the interruption state: --measure-on-interrupts off
• Only measure the interruption state: --measure-on-interrupts only
Metrics Available from this Measurement
The following metrics are available from this event set. These descriptions do not take into account
any command-line options you might use.
The metrics are:
• Snoop Count
Counts snoops from the CPU or non-CPU (all snoops) for one sampling period.
• Hitm Count
Counts the number of bus snoop requests from remote processors that hit a modified line in
the local processor. Counts snoops from the CPU or non-CPU (all snoops).
• Avg Snoop Stall Cycles
This is the average number of bus clocks that the Front Side Bus (FSB) is stalled for a snoop.
c2c Event Set 233