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Beginner
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Ivy Bridge performance monitoring events CYCLE_ACTIVITY.*?

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Hi,

In "Intel 64 and IA-32 Architectures Optimization Reference Manual" (April 2012) B.3.2.3 Memory Bound Characterization, it says that: "In Intel microarchitecture code name Ivy Bridge, a new performance monitoring event 'CYCLE_ACTIVITY.STALLS_LDM_PENDING' is provided to estimate the exposure of memory accesses..." However I could not find such an event in Ivy Bridge performance events list (Table 19-2) in "Intel 64 and IA-32 Architectures Software Developer's Manual Volumes 3". In fact none of the CYCLE_ACTIVITY.* events mentioned in Optimization Reference Manual exist in the Ivy Bridge events list. Why are these events not documented?

Thanks!

Jim

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New Contributor II
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Hi Jim,

The events will be appearing in the upcoming revision of the SDM. In the meantime you can use this list for counting these events:

0xA3 0x01 CYCLE_ACTIVITY.CYCLES_L2_PENDING

0xA3 0x08 CYCLE_ACTIVITY.CYCLES_L1D_PENDING

0xA3 0x02 CYCLE_ACTIVITY.CYCLES_LDM_PENDING

0xA3 0x04 CYCLE_ACTIVITY.CYCLES_NO_EXECUTE

0xA3 0x05 CYCLE_ACTIVITY.STALLS_L2_PENDING

0xA3 0x06 CYCLE_ACTIVITY.STALLS_LDM_PENDING

0xA3 0x0C CYCLE_ACTIVITY.STALLS_L1D_PENDING

Regards,
Hussam

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New Contributor II
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Hi Jim,

The events will be appearing in the upcoming revision of the SDM. In the meantime you can use this list for counting these events:

0xA3 0x01 CYCLE_ACTIVITY.CYCLES_L2_PENDING

0xA3 0x08 CYCLE_ACTIVITY.CYCLES_L1D_PENDING

0xA3 0x02 CYCLE_ACTIVITY.CYCLES_LDM_PENDING

0xA3 0x04 CYCLE_ACTIVITY.CYCLES_NO_EXECUTE

0xA3 0x05 CYCLE_ACTIVITY.STALLS_L2_PENDING

0xA3 0x06 CYCLE_ACTIVITY.STALLS_LDM_PENDING

0xA3 0x0C CYCLE_ACTIVITY.STALLS_L1D_PENDING

Regards,
Hussam

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Beginner
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Hi Hussam,

Thanks a lot! This is very helpful.

Do these events also work for Sandy Bridge?

Jim
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New Contributor II
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Yes, the events apply to Sandy Bridge as well. Future SDM should also reflect this.
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Beginner
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Great! Thanks!
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New Contributor I
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Until today the Ivy Bridge PMU Events table (19-5) in SDM 3B is missing the events for CYCLE_ACTIVITY.STALLS_ . These events, however, appear in Intel VTune event list for 3rd generation machines.

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