metric provides the average number of requests that are live in the OOQ per cycle. High numbers of OOQ entries indicates excessive snoop response timing.

snoop Event Set

Available only on Itanium 9300 quad-core processor systems. The snoop event set provides data about snoop responses.

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[:alluserkernel]

•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.

Metrics Available for Intel Itanium 2 and dual core Itanium 2 processor systems

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.

•128 Byte - Miss

This is the fraction of 128-byte data snoops that miss, out of all data snoops (64-byte and 128-byte).

•128 Byte - Hit

This is the fraction of 128-byte data snoops that hit a cache line, out of all data snoops (64-byte and 128-byte).

•128 Byte - Hitm

This is the fraction of 128-byte data snoops that hit a modified cache line, out of all data snoops (64-byte and 128-byte).

•128 Byte - Impwb

This is the fraction of 128-byte data snoops that are due to implicit write backs, out of all data snoops (64-byte and 128-byte).

•64 Byte - Miss

This is the fraction of 64-byte data snoops that miss, out of all data snoops (64-byte and 128-byte).

258 Event Set Descriptions for CPU Metrics