Hello, The following event is missing the 0x for the event_code (in the KnightsLanding files): { "EventCode": "B7", "UMask": "0x01,0x02", "EventName": "OFFCORE_RESPONSE", "BriefDescription": "Counts the matrix events specified by MSR_OFFCORE_RESPx", "PublicDescription": "Counts the matrix events specified by MSR_OFFCORE_RESPx", "Counter": "0,1", "PEBScounters": "0", "SampleAfterValue": "100007", "MSRIndex": "0", "MSRValue": "0", "CounterMask": "0", "Invert": "0", "AnyThread": "0", "EdgeDetect": "0", "PEBS": "0", "Data_LA": "0", "Errata": "null", "Offcore": "0" } Gerd