https://community.intel.com/t5/Analyzers/Finding-L1-bound-Using-Vtune/m-p/1706423#M25867 <P>Hi, I look at Vtune logs and documents. L1 bound in top-down metrics is defined and calculated as follows&nbsp;</P><P>L1_Bound = 100 * max(0, (EXE_ACTIVITY.BOUND_ON_LOADS - MEMORY_ACTIVITY.STALLS_L1D_MISS) / CPU_CLK_UNHALTED.THREAD)<BR /><BR />Are EXE_ACTIVITY.BOUND_ON_LOADS, and&nbsp;MEMORY_ACTIVITY.STALLS_L1D_MISS counted in slots not cycles? If yes, shouldn't we divide it by the total number of slots?<BR /><BR />The problem is that when I get these event counters, I can get these&nbsp;<BR /><BR />EXE_ACTIVITY.BOUND_ON_LOADS 69010262370.0</P><P>MEMORY_ACTIVITY.STALLS_L1D_MISS 64751552228.0</P><P>CPU_CLK_UNHALTED.THREAD 200677632402.0</P><P>&nbsp;</P><P>So L1_Bound = 2.2% but Vtune reports 21%?<BR />Is there a factor of 10 missing?!!</P> Wed, 30 Jul 2025 04:11:47 GMT meta1360 2025-07-30T04:11:47Z https://community.intel.com/t5/Analyzers/Finding-L1-bound-Using-Vtune/m-p/1706423#M25867 <P>Hi, I look at Vtune logs and documents. L1 bound in top-down metrics is defined and calculated as follows&nbsp;</P><P>L1_Bound = 100 * max(0, (EXE_ACTIVITY.BOUND_ON_LOADS - MEMORY_ACTIVITY.STALLS_L1D_MISS) / CPU_CLK_UNHALTED.THREAD)<BR /><BR />Are EXE_ACTIVITY.BOUND_ON_LOADS, and&nbsp;MEMORY_ACTIVITY.STALLS_L1D_MISS counted in slots not cycles? If yes, shouldn't we divide it by the total number of slots?<BR /><BR />The problem is that when I get these event counters, I can get these&nbsp;<BR /><BR />EXE_ACTIVITY.BOUND_ON_LOADS 69010262370.0</P><P>MEMORY_ACTIVITY.STALLS_L1D_MISS 64751552228.0</P><P>CPU_CLK_UNHALTED.THREAD 200677632402.0</P><P>&nbsp;</P><P>So L1_Bound = 2.2% but Vtune reports 21%?<BR />Is there a factor of 10 missing?!!</P> Wed, 30 Jul 2025 04:11:47 GMT https://community.intel.com/t5/Analyzers/Finding-L1-bound-Using-Vtune/m-p/1706423#M25867 meta1360 2025-07-30T04:11:47Z