LBR Empty records

Software Tuning, Performance Optimization & Platform Monitoring

Discussion regarding monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform updating.

LBR Empty records

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I'm using LBR to trace a program, each time before i'm starting to trace I overwrite the MSR_LASTBRANCH_(N-1)_FROM_IP/TO values with value 0 and execute a few instructions and read out the values. sometimes I'm getting empty records (or skipped record) with values of zero, why would this ever happen?

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