I've been trying to measure PCIe performance on the two types of machines on Linux I work with but neither of them work out well. I summarize my questions below and any help is welcomed. I always ran PCM as root.
1. Xeon E5-2650v2, Ivy Bridge, Linux Kernel 3.13
Keep getting "
ERROR: QPI LL monitoring device (0:7f:8:2) is missing. The QPI statistics will be incomplete or missing.
ERROR: QPI LL monitoring device (0:7f:9:2) is missing. The QPI statistics will be incomplete or missing.
" and the PCM cannot be successfully launched. Can PCM run on this type of machines, or impossible due to the missing device reported?
2. Xeon E5-2450, Sandy Bridge, Linux Kernel 3.13
PCM can run on this types of machines. The tool automatically select the older version of parameters where MMIO measurement is missing. I manually set the tool to always choose the newer version, but "WiL" returns 0 all the time when I ran a small RDMA flow. How can I use the PCM tool to measure MMIO traffic in this type of machines?
Thank you in advance for your great help!