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PCM_IIO_README.md

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Purpose:

PCM-IIO tool monitors PCIe transactions with a breakdown per PCIe bus (IIO stack) and/or PCIe devices.

Tool UI introduction:

Inbound (PCIe device DMA into system) metrics:

  • IB write (inbound write): the number of bytes per second that the PCIe device requested to write to main memory through DMA
  • IB read (inbound read): the number of bytes per second that the PCIe device requested to read from main memory through DMA

Outbound (CPU MMIO to the PCIe device) metrics:

  • OB read (outbound write): the number of bytes per second that the CPU requested to write to the PCIe device through MMIO (Memory-mapped I/O)
  • OB write (outbound read): the number of bytes per second that the CPU requested to read from the PCIe device through MMIO

IOMMU metrics:

  • IOTLB Lookup: IOTLB lookups per second
  • IOTLB Miss: IOTLB misses per second
  • Ctxt Cache Hit: Context cache hits per second
  • 256T Cache Hit: Second Level Page Walk Cache Hits to a 256T page per second
  • 512G Cache Hit: Second Level Page Walk Cache Hits to a 512G page per second
  • 1G Cache Hit: Second Level Page Walk Cache Hits to a 1G page per second
  • 2M Cache Hit: Second Level Page Walk Cache Hits to a 2M page per second
  • IOMMU Mem Access: IOMMU memory accesses per second

Sample output:

image

Event config file:

pcm-iio tool allows the user to customize the performance events with a config file as an advanced feature. The event config files are in opCode-x-y.txt files where x/y is cpu family is model id, for example 6/143 for Sapphire Rapids.