810 VFIO , SRIOV, multi-process stats read DPDK testpmd.

[spyroot <spyroot@gmail.com>]

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Hi Folks,

I'm observing some unexpected behavior related to how statistics are
retrieved from a Physical Function (PF) on an Intel 810 NIC.

*Scenario:* I have two dpdk-testpmd instances running in separate
Kubernetes pods (same worker node). Each instance uses the -a flag to bind
to a different VF. (i.e to have consistent port id 0)

*Questions:*

   1.

   *PF Statistics and 64B Line Rate:*
   I'm noticing that the RX packet-per-second value reported on the PF side
   for a given VF is *higher than the theoretical maximum* for 64-byte
   packets.
   -

      Does the Intel 810 PMD apply any kind of optimization, offloading, or
      fast path processing when two VFs (e.g., A and B) are on the same PF?
      2.

   *Concurrent Stats Polling:*
   -

      When two separate dpdk-testpmd processes are running (in pod A and
      pod B), does the PMD or driver layer support concurrent reading of PF
      statistics?
      -

      Is there any locking or synchronization mechanism involved when
      multiple testpmd instances attempt to pull stats from the same PF
      simultaneously? ( in essence, does a firmware/OF support
concurrent read).

Thank you,

cd /usr/local/bin && dpdk-testpmd \
  --main-lcore \$main -l \$cores -n 4 \
  --socket-mem 2048 \
  --proc-type auto --file-prefix testpmd_rx0 \
  -a \$PCIDEVICE_INTEL_COM_DPDK \
  -- --forward-mode=rxonly --auto-start --stats-period 1'"

cd /usr/local/bin && dpdk-testpmd \
  --main-lcore \$main -l \$cores -n 4 \
  --socket-mem 2048 \
  --proc-type auto --file-prefix testpmd_rx1 \
  -a \$PCIDEVICE_INTEL_COM_DPDK \
  -- --forward-mode=rxonly --auto-start --stats-period 1'"

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