Software Tuning, Performance Optimization & Platform Monitoring
Discussion around monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform monitoring

What stands for VTD_ACCESS event?

n-okada8442
Beginner
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Hi,

I'm looking for details of VTD_ACCESS.L4_PAGE_HIT events described in Uncore Performance Monitoring Reference Manual. I am testing PCIe performance of two same Cascade Lake systems using VT-d legacy mode and I found there are some differences of VTD_ACCESS related events(especially VTD_ACCESS.L4_PAGE_HIT) behavior between them. I checked that document but nothing is described on it.

What stands for VTD_ACCESS.L4_PAGE_HIT? I presume "L4_PAGE_HIT" means cache hit of PML4 entry. Is it correct?


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