https://community.intel.com/t5/Software-Tuning-Performance/LBR-Empty-records/m-p/998936#M3490 <P>I'm using LBR to trace a program, each time before i'm starting to trace I overwrite the&nbsp;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?<BR /> &nbsp;</P> <P>&nbsp;</P> Sun, 13 Jul 2014 12:44:19 GMT Yoav_A_ 2014-07-13T12:44:19Z https://community.intel.com/t5/Software-Tuning-Performance/LBR-Empty-records/m-p/998936#M3490 <P>I'm using LBR to trace a program, each time before i'm starting to trace I overwrite the&nbsp;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?<BR /> &nbsp;</P> <P>&nbsp;</P> Sun, 13 Jul 2014 12:44:19 GMT https://community.intel.com/t5/Software-Tuning-Performance/LBR-Empty-records/m-p/998936#M3490 Yoav_A_ 2014-07-13T12:44:19Z