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The Ports_Utilized_0 node accounts for cases where zero ports are utilized while the bottleneck is Backend_Bound.Core_Bound.
For front-end starved code patterns, this metric overcounts since there would be no uops to execute to start with.
This bug got re-introduced with the fix for Pause-loop in TMA 4.2
Below is a reproducer a kernel for DSB-misses using perf-tools.
The Ports_Utilized_0 node accounts for cases where zero ports are utilized while the bottleneck is Backend_Bound.Core_Bound.
For front-end starved code patterns, this metric overcounts since there would be no uops to execute to start with.
This bug got re-introduced with the fix for Pause-loop in TMA 4.2
Below is a reproducer a kernel for DSB-misses using perf-tools.
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